PTGS2 and mesothelioma: The quantization of COX-2 and CYP19A1 mRNA in five mesothelioma cell lines (MPP89, Ist Mes2, Ist Mes1, MSTO and NCI) by RT-PCR revealed that Ist Mes-1, Ist Mes-2, and MPP89 cell lines endowed higher mRNA COX-2 levels and exhibited higher mRNA CYP19A1 levels.