In the first study, Wang and coworkers (6) evaluated the prevalence of MAGE-A4 protein expression in 1,750 tumor sections obtained from patients with any HLA-A*02 allele (except HLA-A*02:05P) using an investigational IHC assay with the same antibody clone (OTI1F9) as in this study. The gene discussed is HLA-A; the disease is neoplasm.