Structural Classification Of Cancer
Carcinoma: Cancers derived from epithelial cells. This group includes many of the most common cancers,
particularly in the aged, and include nearly all those developing in the breast, prostate, lung, pancreas,
Sarcoma: Cancers arising from connective tissue (i.e. bone, cartilage, fat, nerve), each of which develop
from cells originating inmesenchymal cells outside the bone marrow.
Lymphoma and Leukemia: These two classes of cancer arise from hematopoietic (blood-forming) cells that leave
the marrow and tend to mature in the lymph nodes and blood, respectively. Leukemia is the most common type of
cancer in children accounting for about 30%.
Germ cell tumor: Cancers derived from pluripotent cells, most often presenting in the testicle or the ovary
(seminoma and dysgerminoma, respectively).
Blastoma: Cancers derived from immature “precursor” cells or embryonic tissue. Blastomas are more common in
children than in older adults.