A common environmental carcinogen unduly affects carriers of cancer mutations: carriers of genetic mutations in a specific protective response are more susceptible to an environmental carcinogen.

Abstract excerpt

One way an inherited cancer gene mutation may target specific tissues for cancer is by increasing susceptibility when a tissue is exposed to environmental carcinogens. An example of this may be the increased susceptibility of BRCA1 or BRCA2 mutation carriers to the carcinogen formaldehyde. Formaldehyde is now a proven cause of human myeloid leukemias. Yet millions of tons of formaldehyde are produced every year...

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