Study of Copanlisib in Combination With Standard Immunochemotherapy in Relapsed Indolent Non-Hodgkin's Lymphoma (iNHL)

Patients should be in need of and fit for immunochemotherapy and should not be resistant to rituximab (resistance defined as lack of response or progression within 6 months of the last date of rituximab administration, including rituximab, and/or rituximab biosimilars, and/or anti-CD20 monoclonal antibody). This study will be composed of two parts: Safety run-in and phase III part. The purpose of the safety run-in part of this study is to assess whether the drug being tested (copanlisib) in combination with standard immunochemotherapy (R-B or R-CHOP) is safe and at what dose level of the study drug (copanlisib - 45mg or 60 mg) patients are able to tolerate the study treatment combination. In addition to finding a safe and tolerable dose level for the phase III part of the study, efficacy will also be evaluated for patients that stay on the study treatment during the safety run-in. The phase III part of the study started with the determined recommended dose of copanlisib of 60 mg in combination with R-B. Combination treatment of copanlisib at the recommended/approved dose of 60 mg with R-B or R-CHOP was completed in April 2021. A maximum of 24 patients will take part in the safety run-in part of this study. In the phase III part approximately 520 patients will be randomly assigned to blinded treatment arms of copanlisib plus R-B or R-CHOP or placebo plus R-B or R-CHOP. Combination therapy (copanlisib/placebo with R-B or R-CHOP) will be administered for a maximum of 6 cycles (C1-C6). Copanlisib/placebo (study drug) monotherapy will be administered from C7 onwards.