What are malignant tumors?

Non-epithelial tumors (Sarcomas (solid mesenchymal tissues, acc to cell type liposarcoma, chondrosarcoma ...) Mesenchyma of blood (leukemia/ lymphomas) Epithelial tumors (All three germ cell layers, all carcinomas, like renal tubular (mesoderm), skin (ectoderm) lining of gut (endoderm)) note that mesoderm gives carcinoma (epithelia), sarcoma (mesenchymal) and hematolymphoid (leukemia lymphoma) Mixed tumors (monoclonal but differentiate into many lineages, salivary glands (pleomorphic adenoma) epithelia + fibromyxoid stroma, fibroadenoma of female breast (ductal elements (adenoma) + loose fibrous tissue (fibroma)