Patients 18 years or older with R/R large B‐cell lymphoma (transformed or de novo DLBCL, primary mediastinal B cell lymphoma and high‐grade B‐cell lymphoma with MYC rearrangement plus rearrangement of Bcl2, Bcl6 or both), FL grade 3B or relapsed MCL. This evidence concerns the gene BCL6 and mantle cell lymphoma.