CYP3A4 and autoimmune pancreatitis: Furthermore, for the first time, the frequency of CYP2C9*2, *3; CYP2C19*2; CYP3A4*1B and CYP3A5*3 alleles has been determined in an AIP population, in which it was found to be similar to that of the general population and between MAIP and LAIP [27–29].