How we can classify neoplasm on the basis of origin and behavior?

Neoplasms can be classified based on their histological type, which refers to the type of tissue in which the cancer originates. The international standard for the classification and nomenclature of histologies is the International Classification of Diseases for Oncology, Third Edition (ICD-O-3).

From a histological standpoint, there are hundreds of different cancers, which are grouped into six major categories:
1. Carcinoma,
2. Sarcoma,
3. Myeloma,
4. Leukemia,
5. Lymphoma, and
6. Mixed types.

Carcinoma refers to a malignant neoplasm of epithelial origin or cancer of the internal or external lining of the body. Carcinomas account for 80 to 90 percent of all cancer cases. Sarcoma refers to cancer that originates in supportive and connective tissues such as bones, tendons, cartilage, muscle, and fat. Myeloma is a cancer that originates in the plasma cells of bone marrow. Leukemia is a cancer of the bone marrow (the site of blood cell production).

Neoplasms can also be classified based on their behavior. According to the International Classification of Diseases (ICD-10), neoplasms are classified into four main groups:
1. Benign neoplasms,
2. In situ neoplasms,
3. Malignant neoplasms, and
4. Neoplasms of uncertain or unknown behavior.

Benign neoplasms are non-cancerous growths that do not spread to other parts of the body and are not life-threatening. In situ, neoplasms are abnormal growths that remain in their original location and have not spread to other parts of the body. Malignant neoplasms, also known as cancers, are abnormal growths that can invade and destroy nearby tissue and spread to other parts of the body. Neoplasms of uncertain or unknown behavior are growths for which it is not yet known whether they are benign or malignant.