Types of carcinomas include basal cell carcinoma, squamous cell carcinoma, invasive ductal carcinoma, ductal carcinoma in situ and renal cell carcinoma, according to WebMD. Basal cell carcinoma is the most common form of cancer and is found in the cells that line the deepest part of the skin's outer layer.
Squamous cell carcinoma is found mainly on skin on the face, ears, neck, lips and back of the hands but can also occur in the digestive tract, the respiratory tract and certain other organs, notes WebMD. Renal cell carcinoma is the most common kidney cancer. Ductal carcinoma in situ is breast cancer that is found in the ducts of the breast but has not spread. Invasive ductal carcinoma is breast cancer that started in the milk duct and spread to the fatty tissue in the breast.