Immunotherapy After Surgery in Treating Patients With Breast Cancer, Colon Cancer, or Melanoma

RATIONALE: Immunotherapy uses different ways to stimulate the immune system and stop cancer cells from growing. Immunotherapy biological extracts may be useful as adjuvant therapy in treating patients who have had surgery for breast cancer, colon cancer, or melanoma.
PURPOSE: Phase III trial to study the effectiveness of Corynebacterium granulosum extract as maintenance immunotherapy following surgery in treating patients with breast cancer, colon cancer, or melanoma.