The invention relates to the field of
biomedicine, and discloses application of an HLA-B * 27: 04
allele in preparation of a product for evaluating the risk of
drug rash caused by
hydroxychloroquine. The application comprises the step of predicting the
medication risk of a subject by detecting whether the subject carries the HLA-B * 27: 04
allele or not. The HLA-B * 27: 04
allele is found to be strongly related to the
drug rash caused by the
hydroxychloroquine for the first time and can be used as a risk
genetic marker of the
drug rash caused by the
hydroxychloroquine. In practical application, the risk of drug eruption of a subject needing to be treated by using hydroxychloroquine can be predicted by detecting whether the HLA-B * 27: 04 allele is carried by the subject, and the risk of drug eruption caused by hydroxychloroquine of the subject carrying the HLA-B * 27: 04 allele after the subject uses hydroxychloroquine is obviously higher than that of a non-carrier. The detection product provided by the invention is high in specificity, high in positive
predictive value and good in clinical application prospect.