3. The patients must either: a) have pain that has developed as a consequence of cancer therapy with either vinca alkaloids, taxanes, bortezomib, thalidomide, platinum-based compounds or ionizing irradiation. OR b) have no pain that has developed as a consequence of cancer therapy, and are just entering chemotherapy with taxanes, vinka alkaloids, bortezomib, thalidomide, or platinum-based compounds