Disease Management Program or Usual Care in Patients With Stage III or Stage IV Lung Cancer, Pancreatic Cancer, Ovarian Cancer, or Colorectal Cancer, and Their Caregivers

RATIONALE: A disease management program may be more effective than standard therapy in improving quality of life and controlling symptoms in patients with cancer. PURPOSE: This clinical trial is studying a disease management program to see how well it works compared with usual care in patients with stage III or stage IV lung cancer, stage III or stage IV pancreatic cancer, stage III or stage IV ovarian cancer, or stage III or stage IV colorectal cancer, and their caregivers.