This is a single-arm phase II study of obinutuzumab, atezolizumab with or without RT in treatment-naïve advanced FL. Participants will initially receive 2 cycles of induction treatment with obinutuzumab and atezolizumab. During cycle 2, participants will undergo disease assessment by PET/CT scan, results of which will determine further induction treatment. Participants in Complete Medical Response (CMR) according to Lugano criteria will receive an additional 4 cycles of induction treatment. Participants who achieve a partial response (PR), stable disease (SD) or deemed to have minor/asymptomatic progressive disease (PD) will also receive 4 further cycles of induction treatment, with the addition of involved-site RT to residual sites of disease (4Gy in 2 fractions), administered between cycle 3 and cycle 4. Participants with symptomatic PD following 2 cycles of induction treatment will not receive any further study treatment. Further treatment will be at the discretion of the treating clinician.~At the end of the induction phase, disease response will again be assessed by PET/CT scan. All participants in CR, PR or SD will move into the maintenance phase of the study and will receive obinutuzumab for 24 months (up to a total of 12 doses). Participants with PD at the end of induction will cease protocol treatment and further treatment will be as per local guidelines.
This single-arm phase II interventional study aims to assess disease response to, and toxicity of, a combination of obinutuzumab and atezolizumab, with or without radiotherapy, in treatment naive Follicular Lymphoma.~The study will involve an induction phase and a maintenance phase for responding participants, for up to 24 months. Response to treatment will be monitored using medical imaging and clinical assessment.