Do you know are most cancers both inherited and environmental?

Enviromental: About 5% of malignancies are inherited such as with the BRACA gene or with hereditary bowel malignancies. 90-95% of cancers evolve over several years from exposure to carcinogens and viruses. In many cancers an EBV infection is also necessary since this virus has sequences that stimulate telomerase activity which adds the immortality that tumors need.