This paper presents the Generalized CaseView method applied to the study of polymorphisms of MDR1 (Multi Drug Resistant), a gene coding for a trans-membrane transporting protein. The data base contains Single nucleotide polymorphisms, their positions in cDNA, and the Area Under the Curve of drugs concentrations. The generalized CaseView method permits a compact visualization of these data. The main result is that pharmacokinetics of some anticancer drugs depends on the genotype.