1.   ----- Scientists say there is no such thing as a suicide gene.

2.   It would activate the suicide gene, killing his prostate cells, but leaving every other cell of his body untouched.

3.   The search for a suicide gene is part of a long and frustrating scientific quest for genetic factors in mental illness.

4.   The technique involves inserting a suicide gene into the cells that proliferate to clog the arteries.

5.   Unfazed, other scientists have pursued the suspected suicide gene.

6.   Desrosiers said he doubts the suicide gene will work.

7.   He also injected a virus carrying an immune-system stimulant to intensify the effect of the suicide gene.

8.   The tumor cells absorbed the suicide gene, making the cells susceptible to a drug called ganciclovir, which is used to treat herpes.