**5. Conclusions**

We observed a significant dominance of the CC *TaqI* and AA *ApaI* genotypes in patients with PBC and AIH. Moreover, the impaired quality of life in patients with AIH was significantly associated with the presence of the AA *ApaI* variant of the *VDR* gene. Awareness of this association can contribute to a deeper understanding of the mechanisms responsible for the occurrence of symptoms associated with poorer quality of life, thereby offering the chance to improve the care of AIH patients.

**Author Contributions:** Conceptualization, A.K.-P. and M.M.; methodology, A.K.-P., M.A., M.C., and M.K.J.; validation, A.K.-P., M.M., and M.K.J.; formal analysis, A.K.-P., M.A., M.C., and M.M.; investigation, P.M.; resources, A.K.-P., M.M., and P.M.; data curation, A.K.-P., M.A., M.K.J., and M.C.; writing—original-draft preparation, A.K.-P. and M.M.; writing—review and editing, all authors; visualization, A.K.-P. and M.A.; supervision, M.M. and P.M.; project administration, A.K.-P., M.M., M.K.J., and P.M.; funding acquisition, A.K.-P., M.M., and P.M. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research received no external funding.

**Conflicts of Interest:** The authors declare no conflict of interest.
