Interestingly, the mRNA levels of the S1P‐related factors (tumour/non‐tumour ratio) other than SPL (tumour/non‐tumour ratio) showed no significant correlations with the levels of the diacyl PLs or glyceroLPLs (tumour/non‐tumour ratio) (Table S3), suggesting that SPL might have crucial roles in the metabolic conversion pathway from sphingolipids to glyceroLPLs. The gene discussed is SGPL1; the disease is neoplasm.