11.   SIR, -- Dr Beral and Dr Reeves support an interesting hypothesis about possible similarities in the role of pregnancy and of oral contraceptive use on breast cancer risk.

12.   Hence the effect of early use on breast cancer risk at or above this age is difficult to determine.

13.   Alar withdrew from the market but subsequent studies in Britain and America have since concluded that the cancer risk was negligible.

14.   Also, researchers found no association between overall brain cancer risk and cell phone use.

15.   Although it increases cancer risk by just several fold, the numbers soon add up, making it a major cause of cancer.

16.   Although mammograms in women this young could theoretically increase cancer risk, the researchers say, the benefits may outweigh the risks.

17.   Among promising treatments are those using mock estrogens, chemicals that act like estrogen in fending off heart disease and menopausal symptoms, but do not increase cancer risks.

18.   And another study suggests estrogen may reduce colon cancer risk.

19.   And high circulating estrogen levels are a known cancer risk.

20.   And some scientists say it actually increased cancer risks and its failure may have been a blessing in disguise.