NCT00003599 2012-02-22Vitamin E in Preventing the Side Effects of Isotretinoin in Former and Current Smokers Who Are Receiving Isotretinoin to Prevent Lung CancerM.D. Anderson Cancer CenterPhase 3 Withdrawn
NCT00002506 2011-05-12Isotretinoin Plus Interferon in Treating Patients With Recurrent CancerHoag Memorial Hospital PresbyterianPhase 2 Completed