Causal associations between thyroid cancer and IgA nephropathy: a Mendelian randomization study

Area of Science:

• Nephrology
• Endocrinology
• Genetics

Background:

• Rising global incidence of kidney disease linked to thyroid cancer.
• Observational studies face limitations in establishing independent associations.
• Mendelian randomization (MR) approach employed to investigate causality.

Purpose of the Study:

• To genetically investigate the causal relationship between thyroid cancer and immunoglobulin A nephropathy (IgAN).

Main Methods:

• Utilized Mendelian randomization (MR) analysis.
• Identified 52 genetic loci and single nucleotide polymorphisms (SNPs) associated with thyroid cancer.
• Applied inverse variance weighted (IVW), MR-Egger, weighted mode, and penalized weighted median methods for analysis and sensitivity testing.

Main Results:

• The IVW method indicated a significant causal effect of thyroid cancer on IgAN risk (OR, 1.191; P < 0.001).
• Weighted mode and penalized weighted median methods yielded similar significant results.
• MR-Egger method suggested a non-significant inverse association (OR, 0.948; P = 0.316).
• Sensitivity analyses, including leave-one-out, did not identify influential individual SNPs.

Conclusions:

• The IVW model suggests a significant causal link between thyroid cancer and IgAN.
• Conflicting results from MR-Egger warrant caution.
• The study does not provide conclusive evidence for a stable, significant causal association.
• Further research is recommended for confirmation.