Explain the different types of cancers.

Explanation

A. Types of cancers : There are different types of cancers such as carcinomas (cancers of epithelial tissues / cells which are most common as epithelial cells divide more often), sarcomas (cancers of connective tissues), leukemias(cancers of bone marrow cells resulting in understrained production of WBC-a liquid tumor), lymphomas (cancers of the lymphatic system). Certain types of cancers are called .familial cancers.(cancer that occurs în families genetic based) and others .sporadic cancers. (non-hereditary cancers occurring without any family history). Some types of cancers are caused by.tumor forming RNA viruses. (oncoviruses), e.g. Rous sarcoma virus which causes .avian sarcoma