IL6 and B-cell chronic lymphocytic leukemia: Using an in vitro model, we explored the role of IL-6, IL-8, and IL-17 in the survival of CLL cells, pertaining to their roles alone or in combination, in helping to explain the effect of BMMSCs on CLL growth both in vitro and in the NOD-SCIDγcnull (NSG) mouse model, and also compared the relationship between IL-17/IL-6 levels in CLL patient serum and clinical status [19].