Sensitivity to thyroid hormone indices are associated with papillary thyroid carcinoma in Chinese patients with thyroid nodules

Background The association between thyroid hormone sensitivity and thyroid cancer is unknown, and we aimed to investigate the association between sensitivity to thyroid hormone indices and papillary thyroid carcinoma (PTC) in Chinese patients with thyroid nodules (TNs).

Methods A total of 1,998 patients undergoing thyroid surgery due to TNs from Nanjing Drum Tower Hospital were included in this study.

We evaluated central sensitivity to thyroid hormones, such as thyroid stimulating hormone index (TSHI), TSH T4 resistance index (TT4RI), thyroid feedback quantile-based index (TFQI), and parametric thyroid feedback quantile-based Index (PTFQI).

Peripheral sensitivity to thyroid hormone was evaluated by FT3 to FT4 ratio.

Multivariate logistic regression analysis was performed to evaluate the association between sensitivity to thyroid hormone indices and PTC risk.

Results The results showed that central indices of thyroid hormone sensitivity, including TSHI, TT4RI, TFQI, and PTFQI, were positively associated with PTC risk.

For each SD increase in TSHI, TT4RI, TFQI, and PTFQI, the odds ratios (OR, 95% CI) of PTC were 1.31 (1.18–1.46), 1.01 (1.01–1.02), 1.94 (1.45–2.60), and 1.82 (1.41–2.34), respectively.

On the other hand, the association between peripheral sensitivity to thyroid hormone and PTC was significantly negative.

For each SD increase in FT3/FT4 ratio, the OR (95% CI) of PTC was 0.18 (0.03–0.96), and a negative correlation was found between FT3/FT4 ratio and TNM staging of PTC.

Conclusions Sensitivity to thyroid hormone indices could be used as new indicators for predicting PTC in Chinese patients with TNs.

Future researches are still needed to confirm our findings.