The limited lymphadenectomy includes the removal of the obturatorical and external iliac lymph nodes, the extended one includes the removal of all lymph nodes between pelvic floor and the departure of the inferior mesenteric artery. The primary objective of the study is to record the progression-free survival. Secondary study objectives include the creation of a standard for the surgical treatment and development of quality criteria and implementation of those into international guidelines. The indication for adjuvant chemotherapy for locally advanced tumors is not affected.