The Steinberg and Venzon approach will be employed to select one among different treatment arms as being worthy of further evaluation. This method requires that an adequate gap in the number of responses among different arms be observed in order to limit the probability that the selected arm is actually inferior by more than an indifferent amount. Assuming an error probability of selecting inferior arm pW =10%, with 6 patients per arm, regardless of proportion of irOR expected in each arm, the gap of 2, the largest minimal difference in the number of irOR which must be observed in order to select the arm with the higher number of irOR, provides that difference between highest probability of response and the maximum on the remaining arms is 15%. Therefore, outcomes of at least 4/6 versus the maximum on the remaining 3 arms of 2/6, at least 5/6 versus the maximum on the remaining 3 arms of 3/6 and so forth will lead to selection the most promising arm on the basis of irOR. with an error probability of 10% Otherwise no treatment arm could be considered better than others.