a) What percentage of cancer cases in the UK is not due to lifestyle factors?
b) The article states that in women, cases of lung cancer have increased by 15% to 15,675 since 2002. Calculate the number diagnosed in the previous year (2001). Show your workings.
c) Name the two genes that are most notable as risk factors for breast cancer in women and state what the risk factor is if either of these genes is carried by a woman. How does the term penetrance explain why some women with both genes develop breast cancer but not others?