dlbcl prognosisdiffuse large cell lymphoma prognosisdlbcl survival ratelarge b cell lymphoma prognosislymphoplasmacytic lymphoma prognosisprognosis for follicular lymphomawaldenstrom lymphoma prognosisnon hodgkin lymphoma prognosisprognosis for double hit lymphomarefractory dlbcldlbcl stagingperipheral t cell lymphoma prognosis