UGT2B17 and B-cell chronic lymphocytic leukemia: We then carried out targeted lipidomics to quantify sphingolipid species, including Cer and GluCer, with a specific focus on the fatty‐acid chains C16:0 and C24:1, as well as sphingosine, dihydrosphingosine (also termed sphinganine) and sphingosine‐1‐phosphate (S1P) in three CLL cell lines with low and high expression of the adverse marker UGT2B17.