Abstract:Objective To study the effects of thyroid stimulating hormone (TSH) inhibition therapy on bone metabolism, leukocyte differentiation antigen 44 variant 6 (CD44v6), and soluble interleukin-2 receptor (sIL-2R) levels in patients with differentiated thyroid carcinoma (DTC).Methods From March 2019 to January 2022, 100 patients with DTC admitted to the Affiliated Hospital of Inner Mongolia Medical University were randomly divided into control group (50 cases, given thyroxine replacement therapy after operation) and TSH group (50 cases, given TSH inhibition therapy after operation). Thyroid function indexes [TSH, free triiodothyronine (FT3), free thyroid hormone (FT4)], bone metabolism indexes [total type I collagen amino acid prolongation peptide (PINP), β-collagen special sequence (β-Crosslaps)], immune function indexes [T lymphocyte subsets (CD3+, CD4+, CD8+)], serum CD44V6 and SIL-2R levels, and the safety were compared between the two groups before and after treatment.Results Three months after treatment, the serum TSH level in TSH group was lower than that in the control group (P < 0.05), while the serum FT3 and FT4 levels were higher than that in the control group (P < 0.05); There was no significant difference in the level of Serum PINP and β-Crosslaps (P > 0.05); Three months after treatment, the levels of CD3+ and CD4+ in TSH group were higher than those in the control group (P < 0.05), while the levels of CD8+ in TSH group were lower than those in the control group (P < 0.05); Three months after treatment, the levels of CD44V6 and sIL-2R in TSH group were lower than those in control group (P < 0.05); There was no significant difference in the incidence of adverse reactions between the two groups (P > 0.05).Conclusion TSH inhibition therapy can effectively improve thyroid function, enhance immune function, reduce serum CD44V6 and SIL-2R levels in patients with DTC, and has little effect on bone metabolism, with good drug safety.