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Kaplan‐Meier curves for biochemical relapse free (bRF) rates between clinical trial by use of passive irradiation (CPaI) and standard therapy by use of scanning irradiation (SScI) of (A) low‐, (B) intermediate‐, and (C) high‐risk group after carbon‐ion radiotherapy. There were no significant differences between the two protocols in each risk group.
