CCL11 and B-cell chronic lymphocytic leukemia: Regarding CCL11, this effect is not a peculiar finding in malignant B cells since normal B cells showed the same pattern of secretion; more interestingly, CXCL10 is exclusively produced when MSCs were co-cultured with malignant B cells but not with normal B lymphocytes, supporting a key role for this chemokine in CLL progression.