Anal Squam Cell Cancer

There's a lot of confusing classification systems out there, but how can we break that down to understand it? A i n one, two and three correspond to low, moderate and high grade displasia. The key re hp v zerotypes 16 and 18. There's a higher incidence in immuno suppress patients. So must a little better about aa, intra epithelio neoplasm. This is a precursor to squama cel cancer.