Trial Assessing the Inhibitor of Programmed Cell Death Ligand 1 (PD-L1) Immune Checkpoint Atezolizumab

atezolizumab administered IV 1200 mg Q3W, starting one week before EBRT (Week -1) and continued as an adjuvant for a total maximum of 20 cycles.

"* Pelvic +/- para-aortic EBRT (IMRT): 45 Gy in 25 fractions over 5 weeks (Weeks 1-5, with simultaneously integrated boosts to macroscopically involved lymph nodes, if any, in order to deliver a total dose of 60 Gy to macroscopic lymph nodes (including the dose delivered by brachytherapy).~* Uterovaginal brachytherapy (Week 7; maximum interval between EBRT and brachytherapy: 14 days). If appropriate and feasible, dose escalation will be assumed, particularly for advanced disease, with the objective to deliver a total dose of 85 Gy (equivalent dose in 2-Gy fractions with α/β=10 Gy) to 80% of the High Risk-Clinical Target Volume (HR-CTV), including 45 Gy through EBRT. The total dose might be lower in case of close proximity to organs at risk (OARs).~* Total duration of RT (including brachytherapy) should be ≤ 55 days."

"* Cisplatin infused 40 mg/m2 (maximum 70 mg) weekly IV during EBRT (Weeks 1-5).~* Not administered: during the interval between EBRT and brachytherapy, or during brachytherapy, or if radiotherapy is interrupted."