1.   But when they are damaged, the mutated oncogenes can trigger the uncontrolled proliferation of cells that leads to tumor formation.

2.   He established an international reputation with groundbreaking work on the genetic basis of tumor formation and the genetic effects of irradiation in plants.

3.   Although the numerical balance of chromosomes is restored by the replacement, the mutation can increase the risk of tumor formation.

4.   Animal studies reveal that bitter melon actually block the growth of cancerous tumors in the prostate and inhibit tumor formation in other animal models.