<qa>  How many courses of therapy are removed from study?Patients receive oral fenretinide 3 times daily or 2 times daily if over 18 years of age on days 1-7. Treatment repeats every 3 weeks for up to 30 courses in the absence of disease progression or unacceptable toxicity. Patients in stratum III who fail to achieve a complete response after 8 courses of therapy are removed from study. 