Jun
I think you means three major categories of cancers, which are:
1. Carcinoma
2. Sarcoma and
3. Leukemia/Lymphoma (Hodgkin's and Non-Hodgkin's lymphoma)
Carcinoma is a cancer of epithelial cells such as cancer arising from lining cells of gastrointestinal tract, urinary tract, respiratory tract etc. Also, they can arise fron skin epidermis. Two major carcinomas are Squamous cell carcinoma and Adenocarcinoma.
Sarcoma is a cancer of mesenchymal tissue such as arising for endothelial cells of blood vessels (angiosarcoma), muscle cells (leiomyosarcoma, rabdomyosarcoma), nerve cells (malignant peripheral nerve cell tumor), fat cells (liposarcoma) etc etc
Lymphoma is a cancer of lymphoid cells, predominantly arising in the lymph nodes (Hodgkin's and non-Hodgkin's lymphoma). Leukemia is cancer of blood elements and start in the bone marrow.
There are lots of other cancers such as melanoma (skin tumor) and brain tumor (glioma, meningioma etc.) etc etc. They have the ability to be further classified into many types.
Answer:
There are 4 generic categories if you’ll of cancer.
Lymphomas: Cancer of Lymphatic System
Leukemias: Cancer of Blood or Blood Forming Tissue
Carcinomas: Cancer of Connective Tissue
Sarcomas: Cancer of Structural Tissue
Answer:
What do you mean, the “three types”? There are a great many more than three types of cancer, so I'm not sure what you're asking. Can you explain further? Book Mark it-> del.icio.us | Reddit | Slashdot | Digg | Facebook | Technorati | Google | StumbleUpon | Window Live | Tailrank | Furl | Netscape | Yahoo | BlinkList