Hyperlipidemic patients are retrospectively screened from 2006/1/1 to 2006/12/31. The patient is included if he or she had been receiving atorvastatin or rosuvastatin for at least 3 months and did not receive other lipid-lowering medications 4 weeks before starting atorvastatin or rosuvastatin. Genomic DNA was collected from the blood sample of each patient using genomic DNA purification kit. The single nucleotide polymorphisms (SNPs) were determined afterward.