Malignant tumors are classified based on the tissue of origin. Key types include:
1. Carcinomas: Arising from epithelial cells, these are the most common type of cancer. 2. Sarcomas: Originating from connective tissues such as bone, muscle, and cartilage. 3. Lymphomas: Developing from lymphocytes, a type of white blood cell. 4. Leukemias: Cancers of the blood and bone marrow. 5. Gliomas: Tumors that originate in the glial cells of the brain.
