Risk factors for breast cancer
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Risk factors for breast cancer may be divided into preventable and non-preventable. Their study belongs in the field of epidemiology. Breast cancer, like other forms of cancer, can result from multiple environmental and hereditary risk factors. The term "environmental", as used by cancer researchers, means any risk factor that is not genetically inherited. For breast cancer, the list of environmental risk factors includes the individual person's development, exposure to
microbe A microorganism, or microbe,, ''mikros'', "small") and ''organism'' from the el, ὀργανισμός, ''organismós'', "organism"). It is usually written as a single word but is sometimes hyphenated (''micro-organism''), especially in olde ...
s, "medical interventions, dietary exposures to nutrients, energy and toxicants, ionizing radiation, and chemicals from industrial and agricultural processes and from consumer products...reproductive choices, energy balance, adult weight gain, body fatness, voluntary and involuntary physical activity, medical care, exposure to tobacco smoke and alcohol, and occupational exposures, including shift work" as well as "metabolic and physiologic processes that modify the body's internal environment." Some of these environmental factors are part of the physical environment, while others (such as diet and number of pregnancies) are primarily part of the social, cultural, or economic environment. Although many epidemiological risk factors have been identified, the cause of any individual breast cancer is most often unknowable. Epidemiological research informs the patterns of breast cancer incidence across certain populations, but not in a given individual. Approximately 5% of new breast cancers are attributable to hereditary syndromes, and well-established risk factors accounts for approximately 30% of cases.


Age

The risk of getting breast cancer increases with age. A woman is more than 100 times more likely to develop breast cancer in her 60s than in her 20s. If all women lived to age 95, about one in eight would be diagnosed with breast cancer at some point during their lives. However, the actual lifetime risk is lower than that, because 90% of women die before age 95, most commonly from heart attacks, strokes, or other forms of cancer. The probability of breast cancer increases with age, but breast cancer tends to be more aggressive in younger people.


Sex

Male individuals have a much lower risk of developing breast cancer than females. In developed countries, about 99% of breast cancer cases are diagnosed in female patients; in a few African countries, which represent the highest incidence of male breast cancer, males account for 5–15% of cases. The rate of male breast cancer appears to be rising somewhat. Male breast cancer patients tend to be older than female ones. They are more likely to be diagnosed with hormone-receptor positive tumors, with about six out of seven cases being estrogen-receptor positive. The overall prognosis is worse for male than for female patients.


Heredity

United Kingdom being a member of the International Cancer Genome Consortium is leading efforts to map breast cancer's complete genome.


BRCA1 and BRCA2

In 5% of breast cancer cases, there is a strong inherited familial risk. Two autosomal dominant genes, '' BRCA1'' and ''
BRCA2 ''BRCA2'' and BRCA2 () are a human gene and its protein product, respectively. The official symbol (BRCA2, italic for the gene, nonitalic for the protein) and the official name (originally breast cancer 2; currently BRCA2, DNA repair associated) ...
'', account for most of the cases of familial breast cancer. Women who carry a harmful BRCA mutation have a 60% to 80% risk of developing breast cancer in their lifetimes. Other associated malignancies include ovarian cancer and
pancreatic cancer Pancreatic cancer arises when cell (biology), cells in the pancreas, a glandular organ behind the stomach, begin to multiply out of control and form a Neoplasm, mass. These cancerous cells have the malignant, ability to invade other parts of t ...
. If a mother or a sister was diagnosed breast cancer, the risk of a hereditary ''BRCA1'' or ''BRCA2'' gene mutation is about 2-fold higher than those women without a familial history. Commercial testing for ''BRCA1'' and ''BRCA2'' gene mutations has been available in most developed countries since at least 2004. In addition to the BRCA genes associated with breast cancer, the presence of '' NBR2'', near breast cancer gene 1, has been discovered, and research into its contribution to breast cancer pathogenesis is ongoing.


Other genes

Hereditary non- BRCA1 and non-
BRCA2 ''BRCA2'' and BRCA2 () are a human gene and its protein product, respectively. The official symbol (BRCA2, italic for the gene, nonitalic for the protein) and the official name (originally breast cancer 2; currently BRCA2, DNA repair associated) ...
breast tumors (and even some sporadic carcinomas) are believed to result from the expression of weakly penetrant but highly prevalent mutations in various genes. For instance, polymorphism has been identified in genes associated to the metabolism of estrogens and/or carcinogens ( Cytochrome P450, family 1, member A1, CYP1B1, CYP17A1, CYP19, Catechol-O-methyltransferase,
N-acetyltransferase 2 N-acetyltransferase 2 (arylamine N-acetyltransferase), also known as NAT2, is an enzyme which in humans is encoded by the ''NAT2'' gene. Function This gene encodes a type of N-acetyltransferase. The NAT2 isozyme functions to both activate and ...
,
Glutathione S-transferase Mu 1 Glutathione ''S''-transferase Mu 1 (gene name GSTM1) is a human glutathione ''S''-transferase. Function Cytosolic and membrane-bound forms of glutathione ''S''-transferase are encoded by two distinct supergene families. At present, eight dis ...
, GSTP1, GSTT, . . . ), to estrogen, androgen and vitamin D action (
ESR1 Estrogen receptor alpha (ERα), also known as NR3A1 (nuclear receptor subfamily 3, group A, member 1), is one of two main types of estrogen receptor, a nuclear receptor (mainly found as a chromatin-binding protein) that is activated by the sex h ...
, AR, VDR), to co-activation of gene transcription (
AIB1 The nuclear receptor coactivator 3 also known as NCOA3 is a protein that, in humans, is encoded by the ''NCOA3'' gene. NCOA3 is also frequently called 'amplified in breast 1' (AIB1), steroid receptor coactivator-3 (SRC-3), or thyroid hormone recept ...
), to DNA damage response pathways (
CHEK2 CHEK2 (Checkpoint kinase 2) is a tumor suppressor gene that encodes the protein CHK2, a serine-threonine kinase. CHK2 is involved in DNA repair, cell cycle arrest or apoptosis in response to DNA damage. Mutations to the CHEK2 gene have been linked ...
, HRAS1, XRCC1, XRCC3,
XRCC5 Ku80 is a protein that, in humans, is encoded by the ''XRCC5'' gene. Together, Ku70 and Ku80 make up the Ku heterodimer, which binds to DNA double-strand break ends and is required for the non-homologous end joining (NHEJ) pathway of DNA repai ...
). Sequence variants of these genes that are relatively common in the population may be associated with a small to moderate increased relative risk for breast cancer. Combinations of such variants could lead to multiplicative effects. Sporadic cancers likely result from the complex interplay between the expression of low penetrance genes (''risk variants'') and environmental factors. However, the suspected impact of most of these variants on breast cancer risk should, in most cases, be confirmed in large populations studies. Indeed, low penetrance genes cannot be easily tracked through families, as is true for dominant high-risk genes. Part of the hereditary non- BRCA1 and non-
BRCA2 ''BRCA2'' and BRCA2 () are a human gene and its protein product, respectively. The official symbol (BRCA2, italic for the gene, nonitalic for the protein) and the official name (originally breast cancer 2; currently BRCA2, DNA repair associated) ...
breast tumors may be associated to rare syndromes, of which breast cancer is only one component. Such syndromes result notably from mutations in TP53 (
Li–Fraumeni syndrome Li–Fraumeni syndrome is a rare, autosomal dominant, hereditary disorder that predisposes carriers to cancer development. It was named after two American physicians, Frederick Pei Li and Joseph F. Fraumeni, Jr., who first recognized the syndrom ...
), ATM ( ataxia–telangiectasia), STK11/
LKB1 Serine/threonine kinase 11 (STK11) also known as liver kinase B1 (LKB1) or renal carcinoma antigen NY-REN-19 is a protein kinase that in humans is encoded by the ''STK11'' gene. Expression Testosterone and DHT treatment of murine 3T3-L1 or huma ...
( Peutz–Jeghers syndrome), PTEN (
Cowden syndrome Cowden syndrome (also known as Cowden's disease and multiple hamartoma syndrome) is an autosomal dominant inherited condition characterized by benign overgrowths called hamartomas as well as an increased lifetime risk of breast, thyroid, uterine, ...
). RAB11FIP1, TP53, PTEN and rs4973768 are also associated with increased risk of breast cancer. rs6504950 is associated with lower risk of breast cancer. Mutations in RAD51C confer an increased risk for breast and ovarian cancer.


Prior cancers

People who have previously been diagnosed with breast, ovarian, uterine, or bowel cancer have a higher risk of developing breast cancer in the future. Mothers of children with soft-tissue sarcoma may have an increased risk of breast cancer.


Dietary factors

The Western dietary pattern is associated with an increased risk of breast cancer.


Alcohol

There is strong evidence that
alcohol Alcohol most commonly refers to: * Alcohol (chemistry), an organic compound in which a hydroxyl group is bound to a carbon atom * Alcohol (drug), an intoxicant found in alcoholic drinks Alcohol may also refer to: Chemicals * Ethanol, one of sev ...
consumption increases risk of breast cancer."Breast cancer"
wcrf.org. Retrieved 5 December 2022.


Calcium

Several reviews have found a weak inverse association between dietary calcium intake and breast cancer risk. The World Cancer Research Fund International and
American Institute for Cancer Research The American Institute for Cancer Research (AICR) is a large American cancer research organization associated with the World Cancer Research Fund umbrella organization. As of 2018, the charity has a "one star" rating from Charity Navigator Ch ...
have stated that there is limited evidence that diets high in calcium might decrease the risk of breast cancer.


Fruits and vegetables

High total
dietary fiber Dietary fiber (in British English fibre) or roughage is the portion of plant-derived food that cannot be completely broken down by human digestive enzymes. Dietary fibers are diverse in chemical composition, and can be grouped generally by the ...
consumption and total fruit and vegetable consumption is associated with a reduced risk of breast cancer.


Meat

High total processed meat and red meat consumption are associated with increased breast cancer risk.


Saturated fat

Several reviews of case–control studies have found that saturated fat intake is associated with increased breast cancer risk.


Polycyclic Aromatic Hydrocarbons

Polycyclic aromatic hydrocarbons (PAHs) are a known human carcinogens due to their mutagenic ability to damage DNA which causes cancer. A 2016 study found that sources of PAHs such as grilled and smoked meats (along with other sources such as cigarette smoking and
indoor air pollution Indoor air quality (IAQ) is the air quality within and around buildings and structures. IAQ is known to affect the health, comfort, and well-being of building occupants. Poor indoor air quality has been linked to sick building syndrome, reduce ...
) were associated with 30–50% increase in breast cancer incidence. High risk individuals were those who were active smokers, consumed greater than 55 servings of grilled/smoked meats a year, frequently used indoor fire places, and were exposed to large amounts of traffic pollution. The study was a population-based case-control study conducted on Long island, New York (N=1,508 breast cancer cases/1,556 controls). The authors concluded that while PAHs are ubiquitous, breast cancer risk factors could be modified by dietary and lifestyle changes.


Obesity and Lack of Exercise

Gaining weight after menopause can increase a woman's risk. A 2006 study found that putting on 9.9 kg (22 lbs) after menopause increased the risk of developing breast cancer by 18%. Lack of exercise has been linked to breast cancer by the
American Institute for Cancer Research The American Institute for Cancer Research (AICR) is a large American cancer research organization associated with the World Cancer Research Fund umbrella organization. As of 2018, the charity has a "one star" rating from Charity Navigator Ch ...
. Obesity has been linked to an increased risk of developing breast cancer by many scientific studies. There is evidence to suggest that excess body fat at the time of breast cancer diagnosis is associated with higher rates of cancer recurrence and death. Furthermore, studies have shown that obese women are more likely to have large tumors, greater lymph node involvement, and poorer breast cancer prognosis with 30% higher risk of mortality. Weight gain after diagnosis has also been linked to higher rates of breast cancer recurrence or mortality although this finding is not consistent. Weight gain is often less severe with newer chemotherapy treatments but one study found a significant risk of breast cancer mortality in women who gained weight compared to those who maintained their weight. However, other cohort studies and recent clinical trials have not shown a significant relationship between weight gain after diagnosis and breast cancer mortality. Weight loss after diagnosis has not been shown to decrease the risk of breast cancer recurrence or mortality. However, physical activity after breast cancer diagnosis has shown some associations with reducing breast cancer recurrence and mortality independent of weight loss. Data for both weight loss and physical activity and the effect on breast cancer prognosis is still lacking. There is debate as to whether the higher rate of breast cancer associated with obesity is due to a biological difference in the cancer itself, or differences in other factors such as health screen practices. It has been suggested that obesity may be a determinant for breast cancer screening by mammography. Seventeen scientific studies in the United States have found that as obesity increases in women over 40 years of age the rate of mammography reported decreases significantly. When stratified by race (white vs. black) there was a stronger relationship between obesity and lack of mammography screening among white women. Another study also found lower rates of mammography among those who were overweight and obese compared to those women who were of normal body mass index—this effect was only seen in white women. Obese women are more likely to list pain associated with mammograms as a reason for not getting screened; however, leaner women also list this as a reason for avoiding mammograms. Other reasons obese women may avoid mammography are due to lack of insurance, low income, or embarrassment at the procedure, although when these factors are accounted for, the effect of lower rates of screening are still significant. In contrast, other studies have shown that mammography patterns did not differ among women who were obese compared to those at a healthy weight indicating that there may be biological differences in cancer presentation between these groups.


Hormones

Persistently increased blood levels of estrogen are associated with an increased risk of breast cancer, as are increased levels of the androgens
androstenedione Androstenedione, or 4-androstenedione (abbreviated as A4 or Δ4-dione), also known as androst-4-ene-3,17-dione, is an endogenous weak androgen steroid hormone and intermediate in the biosynthesis of estrone and of testosterone from dehydroepia ...
and testosterone (which can be directly converted by aromatase to the estrogens estrone and estradiol, respectively). Increased blood levels of
progesterone Progesterone (P4) is an endogenous steroid and progestogen sex hormone involved in the menstrual cycle, pregnancy, and embryogenesis of humans and other species. It belongs to a group of steroid hormones called the progestogens and is the m ...
are associated with a decreased risk of breast cancer in premenopausal women. A number of circumstances which increase exposure to endogenous estrogens including not having children, delaying first childbirth, not breastfeeding, early
menarche Menarche ( ; ) is the first menstrual cycle, or first menstrual bleeding, in female humans. From both social and medical perspectives, it is often considered the central event of female puberty, as it signals the possibility of fertility. Gir ...
(the first menstrual period) and late menopause are suspected of increasing lifetime risk for developing breast cancer. However, not only sex hormones, but also
insulin Insulin (, from Latin ''insula'', 'island') is a peptide hormone produced by beta cells of the pancreatic islets encoded in humans by the ''INS'' gene. It is considered to be the main anabolic hormone of the body. It regulates the metabolism o ...
levels are positively associated with the risk of breast cancer.


Pregnancy, childbearing and breastfeeding

Lower age of first childbirth, compared to the average age of 24, having more children (about 7% lowered risk per child), and breastfeeding (4.3% per breastfeeding year, with an average
relative risk The relative risk (RR) or risk ratio is the ratio of the probability of an outcome in an exposed group to the probability of an outcome in an unexposed group. Together with risk difference and odds ratio, relative risk measures the association bet ...
around 0.7) have all been correlated to lowered breast cancer risk in premenopausal women, but not postmenopausal women, in large studies. Women who give birth and breast-feed by the age of 20 may have even greater protection. In contrast, for instance, having the first live birth after age 30 doubles the risk compared to having first live birth at age less than 25. Never having children triples the risk. The studies have found that these risk factors become less material as a woman reaches menopause, i.e. that they affect risk of breast cancer prior to menopause but not after it. In balancing premenopausal reductions in risk from childbirth and lactation, it is important also to consider the
risks In simple terms, risk is the possibility of something bad happening. Risk involves uncertainty about the effects/implications of an activity with respect to something that humans value (such as health, well-being, wealth, property or the environme ...
involved in having a child.


Hormonal contraception

Hormonal contraceptives may produce a slight increase in the risk of breast cancer diagnosis among current and recent users, but this appears to be a short-term effect. In 1996 the largest collaborative reanalysis of individual data on over 150,000 women in 54 studies of breast cancer found a
relative risk The relative risk (RR) or risk ratio is the ratio of the probability of an outcome in an exposed group to the probability of an outcome in an unexposed group. Together with risk difference and odds ratio, relative risk measures the association bet ...
(RR) of 1.24 of breast cancer diagnosis among current combined oral contraceptive pill users; 10 or more years after stopping, no difference was seen. Further, the cancers diagnosed in women who had ever used hormonal contraceptives were less advanced than those in nonusers, raising the possibility that the small excess among users was due to increased detection. The relative risk of breast cancer diagnosis associated with current and recent use of hormonal contraceptives did not appear to vary with family history of breast cancer. Some studies have suggested that women who began using hormonal contraceptives before the age of 20 or before their first full-term pregnancy are at increased risk for breast cancer, but it is not clear how much of the risk stems from early age at first use, and how much stems from use before the first full-term pregnancy.


Hormone replacement therapy

Data exist from both observational and randomized clinical trials regarding the association between menopausal hormone replacement therapy (menopausal HRT) and breast cancer. The largest meta-analysis (1997) of data from 51 observational studies, indicated a relative risk of breast cancer of 1.35 for women who had used HRT for 5 or more years after menopause. The estrogen-plus-
progestin A progestogen, also referred to as a progestagen, gestagen, or gestogen, is a type of medication which produces effects similar to those of the natural product, natural female sex hormone progesterone in the body. A progestin is a ''synthetic co ...
arm of the Women's Health Initiative (WHI), a randomized controlled trial, which randomized more than 16,000 postmenopausal women to receive combined hormone therapy or placebo, was halted early (2002) because health risks exceeded benefits. One of the adverse outcomes prompting closure was a significant increase in both total and invasive breast cancers ( hazard ratio = 1.24) in women randomized to receive estrogen and progestin for an average of 5 years. HRT-related breast cancers had adverse prognostic characteristics (more advanced stages and larger tumors) compared with cancers occurring in the placebo group, and HRT was also associated with a substantial increase in abnormal mammograms. Short-term use of hormones for treatment of menopausal symptoms appears to confer little or no breast cancer risk. A correlation was found between the use of hormonal contraceptives and subsequent reliance on hormone replacement therapy.


Oophorectomy and mastectomy

Prophylactic oophorectomy (removal of ovaries) and mastectomy in individuals with high-risk mutations of BRCA1 or BRCA2 genes reduces the risk of developing breast cancer as well as reducing the risk of developing ovarian cancer. Because of a complex balance of benefits and risks of a prophylactic surgery it is recommended only in very specific cases.


Hormonal therapy

Hormonal therapy has been used for chemoprevention in individuals at high risk for breast cancer. Overall it is recommended only in very special circumstances. In 2002, a clinical practice guideline by the
US Preventive Services Task Force The United States Preventive Services Task Force (USPSTF) is "an independent panel of experts in primary care and prevention that systematically reviews the evidence of effectiveness and develops recommendations for clinical preventive services". ...
(USPSTF) recommended that "clinicians discuss chemoprevention with women at high risk for breast cancer and at low risk for adverse effects of chemoprevention" with a grade B recommendation.


Selective estrogen receptor modulators (SERMs)

The guidelines were based on studies of SERMs from the MORE, BCPT P-1, and Italian trials. In the MORE trial, the relative risk reduction for raloxifene was 76%. The P-1 preventative study demonstrated that tamoxifen can prevent breast cancer in high-risk individuals. The relative risk reduction was up to 50% of new breast cancers, though the cancers prevented were more likely estrogen-receptor positive (this is analogous to the effect of
finasteride Finasteride, sold under the brand names Proscar and Propecia among others, is a medication used to treat hair loss and benign prostatic hyperplasia (BPH) in men. It can also be used to treat excessive hair growth in women and as a part of horm ...
on the prevention of
prostate cancer Prostate cancer is cancer of the prostate. Prostate cancer is the second most common cancerous tumor worldwide and is the fifth leading cause of cancer-related mortality among men. The prostate is a gland in the male reproductive system that sur ...
, in which only low-grade prostate cancers were prevented). The Italian trial showed benefit from tamoxifen. Additional
randomized controlled trials A randomized controlled trial (or randomized control trial; RCT) is a form of scientific experiment used to control factors not under direct experimental control. Examples of RCTs are clinical trials that compare the effects of drugs, surgical te ...
have been published since the guidelines. The IBIS trial found benefit from tamoxifen. In 2006, the NSABP STAR trial demonstrated that raloxifene had equal efficacy in preventing breast cancer compared with tamoxifen, but that there were fewer side effects with raloxifene. The RUTH Trial concluded that "benefits of raloxifene in reducing the risks of invasive breast cancer and vertebral fracture should be weighed against the increased risks of venous thromboembolism and fatal stroke". On September 14, 2007, the US Food and Drug Administration approved raloxifene (Evista) to prevent invasive breast cancer in postmenopausal women.


Endocrine disruptors

Many xenoestrogens (industrially made
estrogenic Estrogen or oestrogen is a category of sex hormone responsible for the development and regulation of the female reproductive system and secondary sex characteristics. There are three major endogenous estrogens that have estrogenic hormonal activ ...
compounds) and other
endocrine disruptor Endocrine disruptors, sometimes also referred to as hormonally active agents, endocrine disrupting chemicals, or endocrine disrupting compounds are chemicals that can interfere with endocrine (or hormonal) systems. These disruptions can cause c ...
s are potential risk factors of breast cancer. Diethylstilbestrol (DES) is a synthetic form of estrogen. It has been used between the early 1940s and 1971. Pregnant women took DES to prevent certain pregnancy complications. However, it also increased their risk of breast cancer. It also increased the risk of breast cancer in the prenatally exposed daughters after they have reached an age 40 years.


Factors in the physical environment

According to a review, the main mechanisms by which environmental compounds increase breast cancer risk are acting like hormones, especially estrogen, or affecting susceptibility to carcinogenesis. The evidence to date generally supports an association between breast cancer and polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs).
Dioxins Dioxin may refer to: * 1,2-Dioxin or 1,4-Dioxin, two unsaturated heterocyclic 6-membered rings where two carbon atoms have been replaced by oxygen atoms, giving the molecular formula C4H4O2 *Dibenzo-1,4-dioxin, the parent compound also known as ...
and organic solvents, on the other hand, have only shown an association in sparse and methodologically limited studies, but are suggestive of an association. Overall, however, evidence is still based on a relatively small number of studies.


Xenoestrogens

Many xenoestrogens (industrially made
estrogenic Estrogen or oestrogen is a category of sex hormone responsible for the development and regulation of the female reproductive system and secondary sex characteristics. There are three major endogenous estrogens that have estrogenic hormonal activ ...
compounds) are
endocrine disruptor Endocrine disruptors, sometimes also referred to as hormonally active agents, endocrine disrupting chemicals, or endocrine disrupting compounds are chemicals that can interfere with endocrine (or hormonal) systems. These disruptions can cause c ...
s, and potential risk factors of breast cancer. Endocrine disruption is the hypothesis that some chemicals in the body, such as Bisphenol A, are capable of interfering with the production, processing, and transmission of hormones. A substantial and growing body of evidence indicates that exposures to certain toxic chemicals and hormone-mimicking compounds including chemicals used in
pesticides Pesticides are substances that are meant to control pests. This includes herbicide, insecticide, nematicide, molluscicide, piscicide, avicide, rodenticide, bactericide, insect repellent, animal repellent, microbicide, fungicide, and lampric ...
, cosmetics and cleaning products contribute to the development of breast cancer. The increasing prevalence of these substances in the environment may explain the increasing incidence of breast cancer, though direct evidence is sparse.


Bisphenol A

Bisphenol A Bisphenol A (BPA) is a chemical compound primarily used in the manufacturing of various plastics. It is a colourless solid which is soluble in most common organic solvents, but has very poor solubility in water. BPA is produced on an industrial s ...
(BPA) is a chemical compound used in the production of plastics found in numerous commercial products, including laptops, baby bottles, food containers, water main pipes, and laboratory and hospital equipment. BPA was first produced in 1891, but its estrogenic properties went undiscovered until the mid-1930s. Today it is considered a xenoestrogen, and it functions as an endocrine disruptor that interferes with hormones in the body and disrupts the normal functioning of the endocrine system. At very low levels the FDA has long considered BPA in food to be safe, but this has been challenged over the years as more information is discovered regarding the effects of the chemical. Rats exposed prenatally to environmentally relevant doses of BPA show an increased number of intraductal hyperplasias (precancerous lesions) in mammary glands that appear during adulthood, while high doses induce the development of carcinomas in breast tissue. Animals exposed to BPA during fetal life develop palpable tumors, and all studies show an increased susceptibility to mammary gland neoplasia that manifests during adulthood. Exposure of mouse dams to environmentally relevant levels of BPA during organogenesis results in considerable alterations in the mammary gland. It was concluded that perinatal exposure to low doses of BPA results in altered mammary gland morphogenesis, induction of precancerous lesions, and carcinoma in situ. A study sought to determine whether early exposure to BPA could accelerate mammary carcinogenesis in a dimethylbenzanthracene (DMBA) model of rodent mammary cancer. In the study, scientists exposed neonatal/prebubertal rats to BPA via lactation from nursing dams treated orally with 0, 25, and 250 µg BPA/kg body weight/day. For tumorigenesis studies, female offspring were exposed to 30 mg DMBA/kg body weight at 50 days of age. DMBA induces mammary tumors and allows chemicals that predispose for mammary cancer to increase the number of mammary adenocarcinomas. The results of the study showed that female rats in the control, BPA 25, and BPA 250 groups administered DMBA exhibited a BPA dose-dependent increase in mammary tumors. The groups had 2.84, 3.82, and 5.00 mammary tumors per rat respectively. Treatment with BPA also reduced tumor latency, with the median tumor latency of 65, 53, and 56.5 days for 0, BPA 25, and BPA 250 groups respectively. Maternal exposure to BPA during lactation decreased time to first tumor latency and increased the number of DMBA-induced mammary tumors in female offspring. If these effects found in rodents carry over to humans, even minimal exposure to BPA could cause an increased risk for breast cancer. The elevated incidence of breast cancer in women has been associated with prolonged exposure to high levels of estrogens. Xenoestrogens, such as BPA have the capacity to perturb normal hormonal actions. This study provides evidence of the estrogenic effects of BPA. In this study the human breast epithelial cells MCF-10F were treated with 10-3 M, 10-4 M, 10-5 M and 10-6 M BPA continuously for two weeks. The cells treated with 10-3 M BPA died on the second day of treatment. The concentration of 10-4 M BPA was also toxic for the breast epithelial cells, and they died on the fourth day of treatment. This data indicated that these concentrations of BPA are toxic for MCF-10F cells. After the two-week observation period it was seen that the cells formed a high percentage of duct like structures in collagen. MCF-10F cells treated with 10-5 M and 10-6 M BPA formed a high percentage of solid masses, 27% and 20% respectively. This data indicates that BPA is able to induce neoplastic transformation of human breast epithelial cells. Epigenetic changes are involved in the early stages of cancer initiation by altering ductulogenesis. BPA was able to induce transformation of human breast MCF-10F epithelial cells. After treatment with BPA, the cells produced fewer collagen tubules and more solid masses. Consumer groups recommend that people wishing to lower their exposure to bisphenol A avoid canned food and polycarbonate plastic containers (which shares resin identification code 7 with many other plastics) unless the packaging indicates the plastic is bisphenol A-free. The National Toxicology Panel recommends avoiding microwaving food in plastic containers, putting plastics in the dishwasher, or using harsh detergents on plastics, to avoid leaching.


Aromatic Amines

Aromatic amines are chemicals that are produced when products such as dyes, polyurethane products, and certain pesticides are made. They are also found in cigarette smoke, fuel exhaust, and in over cooked, burned meat. The three types of aromatic amines monocyclic, polycyclic, and heterocyclic have all been found in recent studies of breast health. Monocyclic amines have been found to cause mammary cancer in rats. Studies have shown that women who eat higher amounts of overcooked meat, meaning more exposure to heterocyclic amines, have also been diagnosed with more post-menopausal breast cancer. Heterocyclic amines also have the ability to copy estrogen and in laboratory studies have been found to encourage the growth of cancerous tumors on human tissue.State of the Evidence, The Connection Between Breast Cancer and the Environment, 2008


Benzene

Benzene is a petrochemical solvent. Benzene exposure mostly originates from air pollution resulting from industrial burning, exhaust and gas fumes, as well as cigarette smoke. Petroleum, its distillates such as gasoline, auto and truck exhausts also contain benzene. The International Agency for Research on Cancer and the National Toxicology Program have labeled benzene as a definite human carcinogen. Multiple studies point to a correlation between benzene exposure and breast cancer risk. Laboratory studies on mice have shown that a high level of benzene exposure can lead to mammary cancer.


DDT

Although the pesticide DDT was banned over 20 years ago, studies have shown that there are still trace amounts found in certain agricultural products, as well as in human and animal milk. While individual studies have come to conflicting conclusions, the most recent reviews of all the evidence conclude that exposure to DDT before puberty increases the risk of breast cancer later in life.


Ethylene oxide

Ethylene oxide is a chemical that can be found in some personal care products, mainly in the form of fragrance. It is also used for the sterilization of various medical objects. The National Toxicology Program has labeled ethylene oxide as a definite human and animal carcinogen. A study done by the National Institute for Occupational Safety and Health including 7,576 women found a direct correlation between breast cancer rates and exposure to ethylene oxide during medical sterilization processes. Also, human breast cells put into contact with small amounts of ethylene oxide in a laboratory can lead to DNA damage of the breast tissue.


Polycyclic aromatic hydrocarbons

Polycyclic aromatic hydrocarbons are chemical products of combustion from coal burners, fuel, cigarette smoke, and various other sources. PAH's are often found in the air and are breathed into the body. PAH's bioaccumulate easily and can copy the estrogen hormone. PAH's can also be genotoxic, meaning they have the ability to harm DNA.


Vinyl chloride

Vinyl chloride is produced when PVC or polyvinyl chloride is made. PVC is found in plastic packaging, outerwear, plastic toys and other plastic products. Vinyl chloride can be found in cigarette smoke and the air around garbage and land fills. It can also be found in the wastewater when PVC is made. The National Toxicology Program and the International Agency for Research on Cancer have both labeled vinyl chloride as a definite human carcinogen.


Tobacco

Until recently, most studies had not found an increased risk of breast cancer from active tobacco smoking. Beginning in the mid-1990s, a number of studies suggested an increased risk of breast cancer in both active smokers and those exposed to secondhand smoke compared to women who reported no exposure to secondhand smoke. By 2005 enough evidence had accumulated for the alifornia Environmental Protection Agencyto conclude that breathing secondhand smoke causes breast cancer in younger, primarily premenopausal women.California Environmental Protection Agency: Air Resources Board, "Proposed Identification of Environmental Tobacco Smoke as a Toxic Air Contaminant" (June 24, 2005)
on January 26, 2006, the Air Resources Board, following a lengthy review and public outreach process, determined ETS to be a Toxic Air Contaminant (TAC).
The Agency concluded that the risk was increased by 70%, based on epidemiological studies and the fact that there are many mammary carcinogens in secondhand smoke. The following year (2006) the US Surgeon GeneralU.S. Department of Health and Human Services. "The Health Consequences of Involuntary Exposure to Tobacco Smoke: A Report of the Surgeon General", 2006
/ref> identified the same risk increase and concluded that the evidence is "suggestive," one step below causal. There is some evidence that exposure to tobacco smoke is most problematic between puberty and first childbirth. The reason is that breast tissue appears most sensitive to chemical carcinogens breast cells not fully differentiated until lactation.J. Russo, I. Russo. "Molecular Basis of Breast Cancer: Prevention and Treatment," Springer, 2003 The likely reason that the older studies of active smoking did not detect risks associated with smoking was that they compared active smokers to all nonsmokers (which includes many passive smokers). The newer studies, which exclude passive smokers from the control group, generally show elevated risks associated with active as well as passive smoking.


Passive smoking

Breathing secondhand smoke increases breast cancer risk by 70% in younger, primarily pre-menopausal women. The California Environmental Protection Agency has concluded that
passive smoking Passive smoking is the inhalation of tobacco smoke, called secondhand smoke (SHS), or environmental tobacco smoke (ETS), by persons other than the intended "active" smoker. It occurs when tobacco smoke enters an environment, causing its inhalat ...
causes breast cancer and the US Surgeon General has concluded that the evidence is ''suggestive'', one step below causal. There is some evidence that exposure to tobacco smoke is most problematic between puberty and first childbirth. The reason that breast tissue appears most sensitive to chemical carcinogens in this phase is that breast cells are not fully differentiated until lactation.


Radiation

Women who have received high-dose
ionizing radiation Ionizing radiation (or ionising radiation), including nuclear radiation, consists of subatomic particles or electromagnetic waves that have sufficient energy to ionize atoms or molecules by detaching electrons from them. Some particles can travel ...
to the chest (for example, as treatments for other cancers) have a relative risk of breast cancer between 2.1 and 4.0. The risk increases with increased dose. In addition, the risk is higher in women irradiated before age 30, when there is still breast development.


Dioxins

Dioxins Dioxin may refer to: * 1,2-Dioxin or 1,4-Dioxin, two unsaturated heterocyclic 6-membered rings where two carbon atoms have been replaced by oxygen atoms, giving the molecular formula C4H4O2 *Dibenzo-1,4-dioxin, the parent compound also known as ...
(most notably the
polychlorinated dibenzodioxins Polychlorinated dibenzodioxins (PCDDs), or simply dioxins, are a group of long-lived polyhalogenated compound, polyhalogenated organic compounds that are primarily anthropogenic, and contribute toxic, Persistent organic pollutant, persistent org ...
) are chemicals that are produced when chlorinated products are burned, such as polyvinyl chloride (PVC). This occurs when chlorinated products are used in certain manufacturing industries. Dioxins are also added to the air when gasoline and diesel fuels break down. Dioxins are able to bioaccumulate, meaning that they settle and stay in human and animal fat for long periods of time. There are many different types of dioxins and only a few of them have been labeled by the Environmental Protection Agency as definite human carcinogens and endocrine hormone disruptors. Although dioxins are floating in the air, they eventually settle on plants and other vegetation surfaces. These plants and vegetation are them eaten by cows and other animals. Humans end up eating the produce, milk, eggs, and meat produced by these animals that have consumed dioxin covered vegetation. Dioxins are more harmful when ingested this way. Multiple studies have led to the idea that increased dioxin levels can increase one's risk for breast cancer. A study done in 1976 after a chemical plant explosion in Seveso, Italy concluded that high dioxin level exposure in a woman's body correlated with a more than double chance of developing breast cancer.


Light at night and disturbance of circadian rhythm

In 1978 Cohen et al. proposed that reduced production of the hormone melatonin might increase the risk of breast cancer and citing "environmental lighting" as a possible causal factor. Researchers at the National Cancer Institute (NCI) and
National Institute of Environmental Health Sciences The National Institute of Environmental Health Sciences (NIEHS) conducts research into the effects of the environment on human disease, as one of the 27 institutes and centers of the National Institutes of Health (NIH). It is located in the Rese ...
conducted a study in 2005 that suggests that artificial light during the night can be a factor for breast cancer by disrupting
melatonin Melatonin is a natural product found in plants and animals. It is primarily known in animals as a hormone released by the pineal gland in the brain at night, and has long been associated with control of the sleep–wake cycle. In vertebrates ...
levels. According to a research in 2008, a reduced melatonin level in postmenopausal women is linked to a higher risk of breast cancer. In 2007, "shiftwork that involves circadian disruption" was listed as a probable carcinogen by the World Health Organization's International Agency for Research on Cancer. (IARC Press release No. 180). Multiple studies have documented a link between night shift work and the increased incidence of breast cancer. A review of current knowledge of the health consequences of exposure to artificial light at night including the increased incidence of breast cancer and an explanation of the causal mechanisms has been published in the '' Journal of Pineal Research'' in 2007.


Ethnicity-related and socioeconomic factors

Incidence and mortality vary with ethnic background and social status. Incidence rises with improving economic situation, while mortality is tied to low economic status. In the US incidence is significantly lower and mortality higher among black women and this difference appears to persist even after adjustment for economic status. It is currently unclear if significant ethnic differences in incidence and mortality persist after adjustment for economic status between women of white, Hispanic and Asian origin in the US. Several studies have found that black women in the U.S. are more likely to die from breast cancer even though white women are more likely to be diagnosed with the disease. Even after diagnosis, black women are less likely to get treatment compared to white women. Scholars have advanced several theories for the disparities, including inadequate access to screening, reduced availability of the most advanced surgical and medical techniques, or some biological characteristic of the disease in the African American population. Some studies suggest that the racial disparity in breast cancer outcomes may reflect cultural biases more than biological disease differences. However, the lack of diversity in clinical trials for breast cancer treatment may contribute to these disparities, with recent research indicating that black women are more likely to have estrogen receptor negative breast cancers, which are not responsive to hormone treatments that are effective for most white women. Research is currently ongoing to define the contribution of both biological and cultural factors. Part of the differences in incidence that is attributable to race and economic status may be explained by past use of hormone replacement therapy


Factors with inconclusive research


1,3-Butadiene

1,3-Butadiene 1,3-Butadiene () is the organic compound with the formula (CH2=CH)2. It is a colorless gas that is easily condensed to a liquid. It is important industrially as a precursor to synthetic rubber. The molecule can be viewed as the union of two viny ...
is an environmental factor that can be found in air pollution and can be produced by combustion engines, as well as petroleum refineries. It is found in cigarette smoke and is also used in the making and processing of certain
synthetic rubber A synthetic rubber is an artificial elastomer. They are polymers synthesized from petroleum byproducts. About 32-million metric tons of rubbers are produced annually in the United States, and of that amount two thirds are synthetic. Synthetic rubbe ...
products and fungicides. The National Toxicology Program has labeled 1,3-Butadiene as definite human carcinogen. The EPA has stated that people are mainly put in contact with this chemical through the means of simple inhalation.


Mammographic density

Mammographic density refers to the relative proportions of radiodense area compared to the radiolucent area on a mammogram, which is basically an x-ray of the breast. The radiodense area on a mammogram is white and is associated with ductal and lobular epithelium, connective tissue and fluid in the breast. The radiolucent area is dark gray or black and is associated with fat in the breast. High mammographic density is associated with a higher risk of developing breast cancer, but the reasons for this link are not certain and are being studied. Conversely, patients with very low mammographic breast density were found to hold a poorer prognosis irrespective of age, BMI and menopausal status.


Red No. 3

Red No. 3 is a coloring agent used in some foods. In laboratory tests human breast cell DNA was found positive for damage when put into contact with Red No. 3, which means that it is genotoxic.


Viruses

Several kinds of viruses with oncogenic potential are suspected to play a role or cause breast cancer. Among the three most commonly studied are the human papilloma virus (HPV), mouse mammary tumour virus(MMTV) and the Epstein-Barr virus (EBV). A study published in 2011, reviewing 85 original molecular research investigations on the presence of one or more of these three viruses found that only seven of the studies convincingly demonstrated the presence of an oncogenic virus biomarker, while twenty-five of the studies were able to show the absence of the virus studied, and the remaining studies were excluded due to shortcomings. Thus, the data from these investigations do not justify a conclusion as to whether HPV, MMTV, or EBV play a causal role in human breast cancer development. Humans are not the only mammals susceptible to breast cancer. Some strains of mice, namely the house mouse (Mus domesticus) are prone to breast cancer which is caused by infection with the mouse mammary tumour virus (MMTV or "Bittner virus" for its discoverer
John Joseph Bittner John Joseph Bittner (February 25, 1904 – December 14, 1961) was a geneticist and cancer biologist, who made many contributions on the genetics of breast cancer research, which were of value, not only in cancer research, but also in a variety of ...
), by random insertional mutagenesis. It is the only animal breast cancer with a known etiology. These findings are taken to mean that a viral origin of human breast cancer is at least possible, though there is no definitive evidence to support the claim that MMTV causes human breast cancer. For example, there may be critical differences between cancer pathogenesis in mice and people. A human homologue of the mammary virus has been described in 1971 and linked to human breast cancer in several small epidemiologic studies.


Factors with minimal or no impact

There is no significant association between first-trimester abortion and breast cancer risk. There is no scientific evidence to prove that any kind of brassiere can cause cancer. The myth that breast cancer is linked with deodorant use has been widely circulated, and appears to originate from a
spam Spam may refer to: * Spam (food), a canned pork meat product * Spamming, unsolicited or undesired electronic messages ** Email spam, unsolicited, undesired, or illegal email messages ** Messaging spam, spam targeting users of instant messaging ( ...
email sent in 1999. There is however no evidence to support the existence of such a link. There is no persuasive connection between fertility medications and breast cancer.


History

In past centuries, the development of breast cancer was most commonly seen as divine punishment or a trial. From ancient Greek medicine until the end of the 17th century, the dominant medical explanation was an imbalance of the
four humors Humorism, the humoral theory, or humoralism, was a system of medicine detailing a supposed makeup and workings of the human body, adopted by Ancient Greek and Roman physicians and philosophers. Humorism began to fall out of favor in the 1850s ...
. By the start of the 18th century, humoralism had generally been rejected. Many other theories were put forward, often related to sexual activity: In 1713, Bernardino Ramazzini said that nuns developed breast cancer at a higher rate than married women because they did not engage in
sexual intercourse Sexual intercourse (or coitus or copulation) is a sexual activity typically involving the insertion and thrusting of the penis into the vagina for sexual pleasure or reproduction.Sexual intercourse most commonly means penile–vaginal penetrat ...
, and the "unnatural" lack of sexual activity caused instability of the breasts; others countered that the cause was frequently too much sexual activity. Other theories from the 18th century included various sorts of problems with the movement of body fluids, such as lymphatic blockages, curdled
breast milk Breast milk (sometimes spelled as breastmilk) or mother's milk is milk produced by mammary glands located in the breast of a human female. Breast milk is the primary source of nutrition for newborns, containing fat, protein, carbohydrates ( lacto ...
or the transformation of pus left after an infection. In modern times, women are more likely to blame themselves, perhaps deciding that their diet, childbearing history, decision not to breastfeed, or level of exercise is the cause.


See also

* Carcinogen#IARC classification of carcinogens *
Epidemiology of breast cancer Worldwide, breast cancer is the most common invasive cancer in women.The most common form of cancer is non-invasive non-melanoma skin cancer; non-invasive cancers are generally easily cured, cause very few deaths, and are routinely excluded from c ...
*
Mouse models of breast cancer metastasis Breast cancer metastatic mouse models are experimental approaches in which mice are genetically manipulated to develop a mammary tumor leading to distant focal lesions of mammary epithelium created by metastasis. Mammary cancers in mice can be cau ...
* Silent Spring Institute


References


External links


Breast Cancer Myths and Facts
!-- Before adding links, make sure they meet the requirements as noted in WP:EL or they may be removed. --> *
GeneReviews/NCBI/NIH/UW entry on BRCA1 and BRCA2 Hereditary Breast/Ovarian Cancer

Breast cancer database
at Silent Spring Institute * {{Tumors Breast cancer Breast cancer, risk factors for