stage 0 penile carcinoma in situ

Stage 0 is divided into stages 0is and 0a. In stage 0is, abnormal cells are found on the surface of the skin of the penis. These abnormal cells form growths that may become cancer and spread into nearby normal tissue. Stage 0is is also called penile intraepithelial neoplasia. In stage 0a, squamous cell cancer that does not spread is found on the surface of the skin of the penis or on the underneath surface of the foreskin of the penis. Stage 0a is also called noninvasive localized squamous cell carcinoma.