41.   Tumors can grow fast, sometimes doubling in two weeks.

42.   Tumors generally grow slowly on the prostate, a walnut-size gland under the bladder and in front of the rectum.

43.   Unfortunately, the tumors grew back.

44.   When he presented a graph showing the mouse tumors growing and regressing several times and then lapsing into dormancy, there was an audible gasp, said Dr. Bouck.

45.   Why tumors grow more rapidly in that group is unclear, but it is probably linked to premenopausal hormones, Kerlikowske said.

46.   Without the nourishment supplied by these vessels, the tumor cannot grow or metastasize.

47.   With too much of the protein, those cells multiply faster than they should and cause cancer tumors to grow to dangerous levels.

48.   Both benign and malignant tumors grow in uncontrolled ways, but malignant cells invade surrounding tissue and distant organs.

49.   But the bottom-line figures for the Front nevertheless suggest deep-rooted and slowly gaining strength, as if it were a tumor growing on the flank of French society.

50.   Once the tumors grew again, the mice were given another round of endostatin.