HPV Genotype Attribution and Disease Burden of Anal Cancer in China

This study in China examines which types (genotypes) of the human papillomavirus (HPV) are most commonly linked to anal cancer. It involves collecting and testing tumor specimens from anal cancer patients to understand the disease burden and which HPV strains are responsible. No treatment is given — this is a surveillance and research study. **You may be eligible if...** - You have been diagnosed with anal cancer - You have not yet received radiation or chemotherapy (so the specimen is unaffected by treatment) **You may NOT be eligible if...** - You have HIV infection - You are on immune-suppressing drugs after an organ transplant - You decline to have your specimen collected and tested - Your specimen is not available (for retrospective cases) Talk to your doctor to see if this trial is right for you.