<qa>  What is the extent of lymphadenectomy?OUTLINE: This is a randomized, multicenter study. Patients are stratified according to depth of tumor penetration T1 or T2 vs T3 vs T4, lymph node involvement 0 vs 1-3, and extent of lymphadenectomy D1 or D2 vs D0 or unknown. Patients are randomized to 1 of 2 treatment arms. 