Radiation Therapy and Fluorouracil With or Without Combination Chemotherapy Followed by Surgery in Treating Patients With Stage II or Stage III Rectal Cancer

Washington Cancer Institute at Washington Hospital Center, Washington D.C.

Cleveland Clinic Taussig Cancer Center, Cleveland

Masonic Cancer Center at University of Minnesota, Minneapolis

Siteman Cancer Center at Barnes-Jewish Hospital - Saint Louis, St Louis

Colon and Rectal Surgery, Incorporated, Omaha

Chao Family Comprehensive Cancer Center at University of California Irvine Medical Center, Orange

UCSF Helen Diller Family Comprehensive Cancer Center, San Francisco

Cancer Care Center at John Muir Health - Concord Campus, Concord

City of Hope Medical Center, Duarte

St. Joseph Hospital Regional Cancer Center - Orange, Orange

H. Lee Moffitt Cancer Center and Research Institute at University of South Florida, Tampa

University of Chicago Cancer Research Center, Chicago

Knight Cancer Institute at Oregon Health and Science University, Portland

Vermont Cancer Center at University of Vermont, Burlington

Tom Baker Cancer Centre - Calgary, Calgary