Kaplan–Meier OS and treatment failure estimates by HLA-DPB1 ΔFD. HLA-DPB1 ΔFD ≤2.665 and >2.665 are shown in dashed and solid lines, respectively, with 95% confidence limits in shades of gray above and below each curve. The significance of differences between strata was calculated by the log-rank test. (A) Kaplan-Meier estimates of OS. P < .009. (B) Kaplan-Meier estimates of treatment failure. P < .014.