5. Clinically negative (N0) lymph nodes (LN) as established by imaging (pelvic ± abdominal CT, MRI or LAG), or negative LN by nodal sampling or dissection (laparoscopy or laparotomy). Patients with radiologic (e.g., CT, MRI or LAG) or radioimmunoscintigraphy (i.e., ProstaScint™) findings suggestive of regional nodal involvement are eligible if cytologic (e.g., needle aspiration) or histologic (e.g., surgical sampling) evaluation shows no evidence of a neoplastic process (i.e., prostatic or non-prostatic malignancy). Patients with equivocal radiologic findings (maximum nodal size ≤ 1.5 cm) are eligible.