31.   She also says tumors grow more quickly in younger women, so early detection is crucial.

32.   Scientists believe one reason tumors grow is that the immune system fails to recognize the cancerous cells.

33.   Some tumors grow fast, others slowly.

34.   Still, some tumors will grow more aggressively, and doctors still do not know how to tell which tumors are more likely to metastasize, or spread.

35.   Squamous-cell tumors grow faster than basals and occasionally spread to other organs.

36.   The needle biopsy was inconclusive, but the tumor was growing so quickly, she opted for a laparoscopic biopsy and the new thermal ablation treatment.

37.   The result, he said, is that the tumors spin off mutant cells that resist the drugs and, ultimately, the tumors grow back, invulnerable.

38.   The tumors can grow, cause great discomfort and could jeopardize fertility.

39.   The tumors grew large and lumpy, grotesque masses that bulged from the soft underbellies of the mice.

40.   They now know how cancer starts, what it takes for tumors to grow, and even how cancer cells sometimes commit suicide.