Cancerous Tumors May Develop from All of the Following EXCEPT

Multiple Choice

Cancerous tumors may develop from all of the following EXCEPT:

A) mutations in several proto-oncogenes or tumor suppression genes.
B) interactions among two or more oncogene products.
C) simultaneous mutations in a proto-oncogene and both copies of a tumor suppression gene.
D) overlapping growth-control mechanisms that when one is compromised by mutation, others take over.
E) all are true.