Adjuvant Radiotherapy After Cystectomy for Patients With Muscle Invasive Bladder Cancer: a Phase II Trial.

A radical cystectomy + extended pelvic lymph node dissection is considered to be the treatment of choice for patients with muscle invasive bladder cancer (MIBC). Despite this aggressive treatment the outcome is poor and ultimately, 30% of the patients with ≥pT3 tumors develop a pelvic recurrence. One- and 2-years survival for patients developing a local recurrence after cystectomy is only 8% and 3% respectively, with a median survival of <4 months. For patients with lymph node recurrence prognosis is somewhat better, but nevertheless still disappointing with reported 1- and 2 years survival of 42% and 11% respectively. The investigators hypothesize that an earlier implementation of external beam radiotherapy (EBRT) i.e. in the adjuvant setting, will prevent local and lymph node recurrence and improve disease free- and overall survival as local recurrence is linked to the development of distant metastasis. Adjuvant EBRT was tested in a prospective randomized trial and resulted in a 20% increase in 5-year disease free survival. Despite those impressive results, severe intestinal toxicity rates hampered the enthusiasm to use adjuvant EBRT, till now. In the last decade, great technological advancements in EBRT planning, such as intensity modulated arc therapy (IMAT), and positioning have been realised. This has resulted in a better coverage of the target volume while sparing normal tissue (mainly small bowel) and in a more precise delivery of the EBRT. Therefore, it is desirable to reconsider the use of adjuvant EBRT in selected MIBC patients.