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Skin cancer can be inherited, studies suggest

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posted on Oct, 11 2009 @ 07:22 PM

They searched through thousands of cases of melanoma reported in Queensland and New South Wales and found 125 twin pairs. In four of the 27 identical twin pairs, both had melanoma, while three of the 98 fraternal twin pairs had both been diagnosed with the deadly skin cancer.

Based on these numbers, having an identical twin with melanoma increased a person's own risk of the disease nearly 10-fold, while melanoma associated with having a non-identical twin with the disease was roughly doubled.

This suggests, the researchers say, that some of the increased melanoma risk can be attributed to genes, in particular interactions between genes. They estimate that genes account for about half of the differences in risk between two people.

This is an incredibly small sample size to draw this conclusion. This scientist should be careful in making such grand assumptions. I would like to see where his grant money comes from. Anything to make people believe that it is genetics (50% according to the research) and not the environment that causes cancer. Industry can continue to pollute the air, earth, and water while we blame our parents for the crappy genes.

posted on Oct, 11 2009 @ 09:17 PM
The study was published in the Journal of Investigative Dermatology.

A Population-Based Study of Australian Twins with Melanoma Suggests a Strong Genetic Contribution to Liability

Melanoma runs within families, but this may be due to either shared genetic or shared environmental influences within those families. The concordance between pairs of non-identical twins compared to that between identical twins can be used to determine whether familial aggregation is due to genetic or environmental factors. Mandatory reporting of melanoma cases in the state of Queensland yielded approximately 12,000 cases between 1982 and 1990. Twins in this study and from the adjacent state of New South Wales (125 pairs in total) were used to partition variation in liability to melanoma into genetic and environmental factors. Identical twins were more concordant for melanoma (4 of 27 pairs) than non-identical twins (3 of 98 pairs; P-valueapproximately0.04). Identical co-twins of affected individuals were 9.8 times more likely to be affected than by chance. However, non-identical co-twins of affected individuals were only 1.8 times more likely to be affected than by chance. An MZ
Z recurrence risk ratio of 5.6 suggests that some of the genetic influences on melanoma are due to epistatic (gene–gene) interactions. Using these data and population prevalences, it was estimated that 55% of the variation in liability to melanoma is due to genetic influences.

Perhaps you can dig around and find the information you need with the link provided.


posted on Oct, 11 2009 @ 09:33 PM
reply to post by Longtimegone

Why would genetics being a reason, surprise you?

I have very fair skin, blond hair, and green eyes. When I was in my teens, I had to see a dermatologist for acne. My grandmothers, and both my parents had been to this same Dr.

Both my parents had skin cancer, and both of my grandmother's also.

Genetics certainly do play a role, since the Dr., pointed out to me that I had a strong likelyhood of getting skin cancer also, due to genetics. I was told this in the 1970's. My mother is from Swedish descent, and my father was from Germany. Common sense means that people with pale skin should not get sunburned! Really, nobody should.

I am a twin, and neither my brother or I have gotten skin cancer. We were warned, and I have not had a sunburn for decades.

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