The 9th International Conference of the Asia Clinical Oncology Society(ACOS)was held at Gifu Grand Hotel, Gifu Japan on August 25, 26, and 27 2010. The Society was established in Osaka, Japan, in October 1991. Meeting have been held every two years, starting in Osaka, and then to Bangkok, Kunming, Bali, Taipei, Seoul, Beijing, Manila, and now to Gifu. There was a twenty year interval in Japan between meetings in Osaka and Gifu. The main theme of the 9th ACOS was titled "Talk to the Worldwide from Asia," and the sub-theme was titled "Multidisciplinary Treatment for Asian Cancer Patients "For this 9th ACOS, we gathered 42 councilors from Asian countries to serve on the ACOS committee and 365 doctors from Japan to serve on a local organizing committee. For congress program, we scheduled 161 special sessions for the president's lectures, key note lectures, special lectures, educational lectures, symposium, workshop, luncheon seminars, etc. We received about 500 abstracts for oral or poster presentations; among them, 140 abstracts came from Asian countries. As for speakers, 475 were from Japan, 85 from Korea, 34 from Taiwan, 27 from China, over 10 from India, Indonesia, Viet Nam, USA, and other countries. Finally a total of 704 speakers were gathered from 20 countries(from the outside Asia; UK, France, Germany, and Australia). The total number of registered investigators was 1, 136, and the total number of participants, including our congress staffs, volunteers, neighborhood doctors, Gifu citizens, patients, etc., was over 1, 500. In this 9th ACOS we discussed some new ideas, such as Asian cancer statistics, mission, vision and core values of ACOS, new anti-cancer drugs developed from Japan(TS-1 and Xeloda), Inter group clinical trials among Asian countries, less invasive surgery using endoscopic assisted operation, Asian traditional medicine, open workshops with citizens, etc. Moreover, we published a commemorative book entitled" Recent Advances of Cancer in Asian Countries.