PPIB and hepatitis A virus infection: In summary, unadjusted Kaplan–Meier analysis revealed statistically significant differences in survival, graft survival, and overall survival among kidney transplant recipients, with those having negative Hepatitis B serology consistently showing better 5-, 10-, and 20-year outcomes compared to those with non-active or chronic Hepatitis B. However, the crossing of the curves indicates a potential violation of the proportional hazards assumption.