What is the fine-grained topic of the following text: Although the studies were not done in human, the authors noted that preclinical studies have reported that ginseng does not appear to reduce the cancer killing activity of tamoxifen, doxorubicin, cyclophosphamide, paclitaxel, 5-fluorouracil, or methotrexate. Only return the topic.
Effects of Ginseng on the Efficacy of Cancer Drugs