PPARG and neuroblastoma: In particular, the delipidation of fetal calf serum, whichremoves known serum lipid mitogens including lysophosphatidicacid [63] and sphingosine 1-phosphate [64], potentiated the degree of15-deoxy-PGJ2-induced growth inhibition via PPARγ-dependent apoptosis in the NB cellline IMR-32.