http://www.nytimes.com/2008/08/31/magazine/31cancer-t.html?ref=magazine&pagewanted=all
 
 
 
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Though still relatively rare (the rate of pregnancy-associated cancer is about 1 in 1,000 pregnancies), the incidence of pregnancy-associated breast cancer is considered to be on the rise. Cancer is primarily a disease of aging, and in the case of breast cancer — the most common cancer diagnosed during pregnancy — age works against women in two ways. First, studies show that women who give birth for the first time at younger ages are less likely to get breast cancer. (The best, perhaps only, argument in favor of teenage pregnancy is that women who get pregnant before age 20 are two to three times less likely to develop breast cancer than women who get pregnant for the first time after 30.) Second, as women increasingly conceive for the first time in their 30s and 40s, their likelihood of developing cancer while pregnant increases. Only 2 percent of breast-cancer cases occur in women under 35, but 1 in 5 are diagnosed in women between the ages of 35
 and 49. It’s at these ages that cancer and pregnancy are most likely to collide. One study showed that among women 35 and younger with cancer, 14 percent were pregnant when their illnesses were diagnosed; another study of women under 45 found that 7 percent were pregnant at the time of diagnosis............. continues

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