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These are cancerous tumors. There are a number of different types, most of which are described in the list below. Other types of malignant anal tumors are very rare.
Squamous cell skin cancer
This is the most common type of tumor. This type of anal cancer begins in the cells that line the anal margin and most of the anal canal. Learn more about squamous cell skin cancer.
Cloacogenic carcinomas (also called transitional cell carcinomas)
These make up most of the remainder of anal cancers. This cancer type affects the cloaca, the bottom part of the large intestine that stores the stool.
These account for a small number of cases of anal cancer, and affect the anal glands. Paget's Disease (not the same as the Paget's bone disease or Paget's disease of the breast) is a type of adenocarcinoma.
Clinical trials are research studies that evaluate a new medical approach, device, drug, or other treatment. As a Stanford Health Care patient, you may have access to the latest, advanced clinical trials.
Open trials refer to studies currently accepting participants. Closed trials are not currently enrolling, but may open in the future.