You may continue receiving OSI-774 for as long as your cancer responds to study treatment. If you continue to receive OSI-774, every 3 months you will have a physical exam (including measurement of vital signs), routine blood tests (about 2 teaspoons), a performance status test (a test looking at the ability to perform everyday activities), a chest x-ray, and a CT or MRI scan. Your doctor may decide to take you off this study if you experience significant side effects or your medical condition worsens.