Tafasitamab Active Not Recruiting Phase 2 Trials for Contiguous Stage II Small Lymphocytic Lymphoma / Stage III Chronic Lymphocytic Leukemia / Prolymphocytic Leukaemia (PLL) / Stage I Small Lymphocytic Lymphoma / Refractory Chronic Lymphocytic Leukemia (CLL) / Stage I Chronic Lymphocytic Leukemia / Noncontiguous Stage II Small Lymphocytic Lymphoma / Stage II Chronic Lymphocytic Leukemia / stage III B-cell small lymphocytic lymphoma / B-cell Small Lymphocytic Lymphoma Recurrent / Stage IV Small Lymphocytic Lymphoma / Stage IV Chronic Lymphocytic Leukemia Treatment