Sequence polymorphisms of mitochondrial D-loop and hepatocellular carcinoma outcome

Area of Science:

• Genetics
• Oncology
• Molecular Biology

Background:

• Mutations and single nucleotide polymorphisms (SNPs) in mitochondrial DNA (mtDNA), particularly the displacement loop (D-loop), are implicated in cancer development and prognosis.
• Hepatocellular carcinoma (HCC) is a major global health concern, necessitating improved prognostic markers.

Purpose of the Study:

• To evaluate the predictive value of D-loop SNPs for post-operational survival in patients with hepatocellular carcinoma (HCC).

Main Methods:

• Statistical analysis, including log-rank tests and multivariate analysis, was employed to assess the association between D-loop SNP genotypes and HCC patient survival.
• Specific SNP sites at nucleotides 146 (T/C) and 150 (C/T) within the mtDNA D-loop were examined.

Main Results:

• No D-loop mutations showed predictive power for post-operational survival in the studied HCC cohort.
• Two specific SNP sites (146 T/C and 150 C/T) were identified as statistically significant predictors of HCC survival via log-rank testing.
• Allele 146C was found to be an independent predictor of poor HCC outcome, with patients carrying allele 146C exhibiting significantly shorter survival compared to those with allele 146T (RR, 2.781; 95% CI, 1.127-6.859; p=0.026).

Conclusions:

• Genetic polymorphisms within the mitochondrial D-loop, specifically at nucleotide 146, can serve as a valuable tool for identifying HCC patient subgroups at higher risk of poor disease outcome.
• This research highlights the potential of mtDNA D-loop genetic analysis in refining prognostic assessments for hepatocellular carcinoma.