IL6R and diffuse large B-cell lymphoma: To address whether the expression of the IL‐6R would generally correlate with the propensity for engraftment of primary human DLBCL cells, we subjected three additional patient samples to immunomagnetic enrichment followed by qRT–PCR for both IL‐6R chains and transplanted all available cells from each donor (in some cases, this number was under 100,000 cells) into MISTRG6 mice.