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Is Breast Asymmetry Linked to Breast Cancer?

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Breast asymmetry refers to when one breast is a different size or shape than the other. A mammogram or breast cancer screening may show asymmetrical breast size or density. What does this mean for a woman’s health?

Most women’s breasts are slightly different in size, shape, and position. Uneven breasts or nipples are not usually a cause for concern.

However, breast tissue or breast density that is significantly uneven has been linked to an increased risk of breast cancer. Regular mammograms can test for abnormalities or changes in breast tissue.

In this article, we look at the causes and diagnosis of asymmetrical breasts, what is normal, and when to see a doctor. We also discuss mammogram results related to asymmetrical breasts and what they mean.

 

Are asymmetrical breasts normal?

Breast asymmetry is normal for women in the majority of cases.

In most cases, breast asymmetry is perfectly normal. In fact, the two sides of the whole body might be slightly different, though any asymmetry may be more noticeable in the breasts.

However, if a person notices a change in the size or shape of one breast, they should see a doctor to find out the cause.

A significant difference in size or shape between the breasts is less common. This does not always cause medical problems, but a doctor can advise on this.

Is breast asymmetry a sign of cancer?

Uneven breasts are not usually a cause for concern. However, it is essential to have regular mammograms to ensure that any breast abnormalities are identified early.

Research from 2015 found that women whose breasts vary in size by over 20 percent may be at higher risk of developing breast cancer.

Any unusual changes in the breast should be checked by a doctor. Changes to look out for include:

  • a lump in or around the breast
  • a lump under the arm
  • tissue that feels thick or firm near the breast or under the arm
  • a change in the size or shape of a breast
  • changes to the nipple, such as it starts to point inward
  • fluid or discharge from the nipple
  • red, itchy, or scaly skin around the breast
  • dimpled or puckered skin

 

Breast asymmetry and mammogram results

A mammogram is an X-ray of the breast, which can test for any abnormalities, including lumps.

A mammogram might reveal that the breasts have different densities. This is referred to as breast asymmetry or focal asymmetry. Focal asymmetry does not always mean that breasts look or feel any different.

Although dense breast tissue is typically as healthy as less dense breast tissue, a mammogram result may suggest a slightly higher risk of developing breast cancer.

If breast asymmetry is new or changes, it is called developing asymmetry. If a mammogram screening identifies developing symmetry, there is a 12.8 percent chance that the person will develop breast cancer.

Other possible causes for an asymmetrical breast density mammogram result include:

  • normal variation in the composition of fats and fibrous tissue in the breasts
  • a cyst in one breast
  • fibrosis, or a large amount of fibrous tissue

According to the American Cancer Society, neither fibrosis or cysts affect a person’s subsequent risk of breast cancer.

Causes of breast asymmetry

During puberty, the left and right breast often develop at a slightly different pace. Breasts may appear asymmetrical until they have finished growing, or they may remain different shapes and sizes throughout a person’s life.

Hormonal changes can cause one or both breasts to change at any point in a person’s life, for example:

  • at specific points in the menstrual cycle
  • during or near menopause
  • during pregnancy or breast-feeding
  • when using a hormonal contraceptive, such as birth control pills

Breasts that change size or shape because of hormones often return to normal. Hormonal changes can also cause breasts to feel lumpy or lose fat and tissue. However, if these changes do not go away, it is a good idea to visit the doctor to who will check for any possible health problems.

Some underlying conditions that can affect breast size and shape include:

  • Tubular breasts: Also called breast hypoplasia, tubular breasts can develop in one or both breasts during puberty.
  • Amastia or amazia: A condition that causes problems in the development of breast tissue, the areola, or nipple.
  • Poland Syndrome: Where a chest muscle does not develop properly, which can affect the breast on one side of the body.

 

Further testing

Anyone who experiences developing asymmetry should visit the doctor for further tests. Tests will likely include another mammogram to check both breasts thoroughly. Ultrasound testing is an additional test to check for any signs of breast cancer.

A doctor may wish to follow up these tests with a biopsy. Tissue from the breast will be sent to a laboratory to check if it contains cancer cells. The tissue sample is usually removed using a fine needle.

Outlook

Breasts that are slightly different sizes do not pose a higher risk for breast cancer. If breasts are significantly different sizes, this may increase the risk.

Breast asymmetry is a medical term that refers to breasts that have different densities. This can be a risk factor for breast cancer.

Anyone who experiences unusual changes in the breast should see a doctor for an examination. Once someone reaches 40, it is essential that they do regular breast self-exams and have regular mammograms.

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Paternal Transmission Of Epigenetic Memory Via Sperm

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Studies of human populations and animal models suggest that a father’s experiences such as diet or environmental stress can influence the health and development of his descendants. How these effects are transmitted across generations, however, remains mysterious.

Susan Strome’s lab at UC Santa Cruz has been making steady progress in unraveling the mechanisms behind this phenomenon, using a tiny roundworm called Caenorhabditis elegans to show how marks on chromosomes that affect gene expression, called “epigenetic” marks, can be transmitted from parents to offspring. Her team’s most recent paper, published October 17 in Nature Communications, focuses on transmission of epigenetic marks by C. elegans sperm.

In addition to documenting the transmission of epigenetic memory by sperm, the new study shows that the epigenetic information delivered by sperm to the embryo is both necessary and sufficient to guide proper development of germ cells in the offspring (germ cells give rise to eggs and sperm).

“We decided to look at C. elegans because it is such a good model for asking epigenetic questions using powerful genetic approaches,” said Strome, a distinguished professor of molecular, cell, and developmental biology.

Epigenetic changes do not alter the DNA sequences of genes, but instead involve chemical modifications to either the DNA itself or the histone proteins with which DNA is packaged in the chromosomes. These modifications influence gene expression, turning genes on or off in different cells and at different stages of development. The idea that epigenetic modifications can cause changes in gene expression that are transmitted from one generation to the next, known as “transgenerational epigenetic inheritance,” is now the focus of intense scientific investigation.

For many years, it was thought that sperm do not retain any histone packaging and therefore could not transmit histone-based epigenetic information to offspring. Recent studies, however, have shown that about 10 percent of histone packaging is retained in both human and mouse sperm.

“Furthermore, where the chromosomes retain histone packaging of DNA is in developmentally important regions, so those findings raised awareness of the possibility that sperm may transmit important epigenetic information to embryos,” Strome said.

When her lab looked at C. elegans sperm, they found the sperm genome fully retains histone packaging. Other researchers had found the same is true for another commonly studied organism, the zebrafish.

“Like zebrafish, worms represent an extreme form of histone retention by sperm, which makes them a great system to see if this packaging really matters,” Strome said.

Her lab focused on a particular epigenetic mark (designated H3K27me3) that has been well established as a mark of repressed gene expression in a wide range of organisms. The researchers found that removing this mark from sperm chromosomes causes the majority of the offspring to be sterile. Having established that the mark is important, they wanted to see if it is sufficient to guide normal germline development.

The researchers addressed this by analyzing a mutant worm in which the chromosomes from sperm and egg are separated in the first cell division after fertilization, so that one cell of the embryo inherits only sperm chromosomes and the other cell inherits only egg chromosomes (normally, each cell of an embryo inherits chromosomes from both egg and sperm). This unusual chromosome segregation pattern allowed the researchers to generate worms whose germ line inherited only sperm chromosomes and therefore only sperm epigenetic marks. Those worms turned out to be fertile and to have normal gene expression patterns.

“These findings show that the DNA packaging in sperm is important, because offspring that did not inherit normal sperm epigenetic marks were sterile, and it is sufficient for normal germline development,” Strome said.

While the study shows that epigenetic information transmitted by sperm is important for normal development, it does not directly address how the life experience of a father can affect the health of his descendants. Strome’s lab is investigating this question with experiments in which worms are treated with alcohol or starved before reproducing.

“The goal is to analyze how the chromatin packaging changes in the parent,” she said.

“Whatever gets passed on to the offspring has to go through the germ cells. We want to know which cells experience the environmental factors, how they transmit that information to the germ cells, what changes in the germ cells, and how that impacts the offspring.”

By demonstrating the importance of epigenetic information carried by sperm, the current study establishes that if the environment experienced by the father changes the epigenetics of sperm chromosomes, it could affect the offspring.

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Father’s Nicotine Use Can Cause Cognitive Problems In Children And Grandchildren

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A father’s exposure to nicotine may cause cognitive deficits in his children and even grandchildren, according to a study in mice publishing on October 16 in the open-access journal PLOS Biology by Pradeep Bhide of Florida State University in Tallahassee and colleagues. The effect, which was not caused by direct secondhand exposure, may be due to epigenetic changes in key genes in the father’s sperm.

Exposure of mothers to nicotine and other components of cigarette smoke is recognized as a significant risk factor for behavioral disorders, including attention deficit hyperactivity disorder, (or ADHD) in multiple generations of descendants. Whether the same applies to fathers has been less clear, in part because in human studies it has been difficult to separate genetic factors (such as a genetic predisposition to ADHD) from environmental factors, such as direct exposure to cigarette smoke.

To overcome this difficulty, Deirdre McCarthy, Pradeep Bhide and colleagues exposed male mice to low-dose nicotine in their drinking water during the stage of life in which the mice produce sperm. They then bred these mice with females that had never been exposed to nicotine. While the fathers were behaviorally normal, both sexes of offspring displayed hyperactivity, attention deficit, and cognitive inflexibility. When female (but not male) mice from this generation were bred with nicotine-naïve mates, male offspring displayed fewer, but still significant, deficits in cognitive flexibility. Analysis of spermatozoa from the original nicotine-exposed males indicated that promoter regions of multiple genes had been epigenetically modified, including the dopamine D2 gene, critical for brain development and learning, suggesting that these modifications likely contributed to the cognitive deficits in the descendants.

Nicotine and cigarette smoke have been previously shown to cause widespread epigenetic changes, Bhide said.

“The fact that men smoke more than women makes the effects in males especially important from a public health perspective. Our findings underscore the need for more research on the effects of smoking by the father, rather than just the mother, on the health of their children.”

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Nutrition Has A Greater Impact On Bone Strength Than Exercise

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ANN ARBOR—One question that scientists and fitness experts alike would love to answer is whether exercise or nutrition has a bigger positive impact on bone strength. University of Michigan researchers looked at mineral supplementation and exercise in mice, and found surprising results–nutrition has a greater impact on bone mass and strength than exercise. Further, even after the exercise training stopped, the mice retained bone strength gains as long as they ate a mineral-supplemented diet.

“The longer-term mineral-supplemented diet leads to not only increases in bone mass and strength, but the ability to maintain those increases even after detraining,” said David Kohn, a U-M professor in the schools of dentistry and engineering.

“This was done in mice, but if you think about the progression to humans, diet is easier for someone to carry on as they get older and stop exercising, rather than the continuation of exercise itself.”

The second important finding is that the diet alone has beneficial effects on bone, even without exercising. This surprised Kohn, who expected exercise with a normal diet to fuel greater gains in bone strength, but that wasn’t the case.

“The data suggests the long-term consumption of the mineral-supplemented diet could be beneficial in preventing the loss of bone and strength with age, even if you don’t do exercise training,” he said.

Combining the two amplifies the effect.

Most other studies look at effects of increasing dietary calcium, Kohn said. The U-M study increased calcium and phosphorous, and found benefits to increasing both.

This isn’t to suggest that people run out and buy calcium and phosphorus supplements, Kohn said. The findings don’t translate directly from mice to humans, but they do give researchers a conceptual place to start.

It’s known that humans achieve peak bone mass in their early 20s, and after that it declines. The question becomes how to maximize the amount of bone when young, so that when declines do begin, people start from a better position, Kohn said.

In addition to testing bone mass and strength, Kohn and colleagues performed a full battery of mechanical assessments on the bone, which is important because the amount of bone doesn’t always scale with or predict the mechanical quality of the tissue.

They tested the mice after eight weeks of training and supplemented diet or normal diet, and then after eight weeks of detraining.

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