<qa>  What is the IIEF Question 1 score?OUTLINE: This is a randomized, placebo-controlled, multicenter study. Patients are stratified according to prior use of sildenafil after treatment on RTOG-9910 and level of response No vs yes unsatisfactory vs yes satisfactory, International Index of Erectile Function IIEF Question 1 score 0-1 vs 2-3, and RTOG-9910 treatment arm I vs II. Patients are randomized to 1 of 2 treatment arms. 