Estimate of Heavy Ion Radiotherapy Candidates in Gunma Prefecture :

1. Organ-specific Indication Rates Based on Quantitative Evidence

Abstract

Background : The number of deaths from cancer is increasing, but surgery and chemotherapy are not indicated for all cancers. Heavy ion radiotherapy is a new radical therapy for patients with primary carcinomas. However, heavy ion radiotherapy can only be conducted at 3 institutions in the world. An evidence-based estimation of the need for heavy ion radiotherapy is required. Subjects and Methods : The results of a clinical trial at the National Institute of Radiological Sciences (NIRS) were statistically compared with the cancer registry data for Gunma Prefecture, and the organ-specific indication rates for heavy ion radiotherapy were determined. Results : The organ-specific indication rates ranged 0% to 47%, with an indication rate of 47% for spleen cancer and 23% for liver cancer. Conclusion : It is expected to proceed the heavy ion radiotherapy, to adequately deploy the facilities over the country.