Objective: To investigate a clinical worth of combination therapy of Oriental and conventional cancer treatment focusing on reduction of chemotherapy-induced side effects. Methods: 110 patients treated by Oriental treatment after intravenous or oral chemotherapy were reviewed, from January, 2005 to April, 2008 at the East-West Cancer Center of Dunsan Oriental hospital. Symptoms were investigated by National Cancer Institute-Common Toxicity Criteria (NCI-CTC) Version 2.0. Results: 80% patients of 110 patients had at least one symptom among eight main side effects (neutropenia, anorexia, nausea, vomiting, diarrhea, stomatitis, constipation, headache). The presence of those was as follows: nausea 63%, anorexia 61 %, neutropenia 45%, vomiting 28%, constipation 21 %, headache 19%, diarrhea 11 %, and stomatitis 10%. Except neutropenia, above symptoms has ameliorated by Oriental treatment in seven treat days. Conclusions: This study first presented the general characteristics of cancer patients treated by Oriental and conventional therapy, and showed a clinical potential of combinational therapy aiming to chemotherapy-induced side effects.