A two-stage study design will be used to evaluate the percentage of patients who do not have disease progression after 24 weeks of treatment with G-202. If the percent of patients who are progression-free at 24 weeks is at most 15%, then the clinical efficacy of G-202 in this patient population will be considered unacceptably low. If, on the other hand, the percent of patients who are progression-free at 24 weeks is at least 35%, this will be considered sufficient evidence to consider further clinical investigation. The null hypothesis that the percent of patients who are progression-free at 24 weeks is at most 15% will be tested against the alternative hypothesis that the percent is greater than 15% at the one-sided 10% significance level. In order to avoid a suspension in accrual awaiting interim analysis, a two-stage study design for evaluating survival probabilities with continual accrual will be used.