Legend: nR = number of irradiated. nN = number of not-irradiated
Three years after the diagnosis of breast cancer the hazard rate rises and later on it declines . This rise is attributed to treatment and it is assumed here that since the woman depends somehow on her tumor its removal initiates the rising hazard. This phenomenon is observed also in female genital cancers where it is augmented by irradiation.
Data source
Surveillance, Epidemiology, and End Results (SEER) Program (www.seer.cancer.gov) SEER*Stat Database: Incidence - SEER 9 Regs Public-Use, Nov 2004 Sub (1973-2002), National Cancer Institute, DCCPS, Surveillance Research Program, Cancer Statistics Branch, released April 2005, based on the November 2004 submission.
The hazard rate of not irradiated women follows the bi-modal pattern described in the previous study, and it is augmented by radiation. For three years following radiation it rises, wherupon it declines.
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