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The most common first recurrence site after dose escalated external beam radiotherapy for prostate cancer is in the prostate and seminal vesicles in all risk groups. In contrast, patients treated without elective pelvic lymph node irradiation are at relatively low risk for isolated pelvic lymph node relapse. Recurrence patterns revealed a tropism for specific anatomical distributions with divergent prognoses, suggesting underlying biological differences among tumors.
Zumsteg et al. (Fri,) studied this question.