Radioiodine Refractory Differentiated Thyroid Cancer

This is a multicenter, open-label, multi-cohort Phase II exploratory study designed to evaluate the efficacy and safety of sacituzumab tirumotecan with or without tislelizumab in patients with unresectable, locally advanced, or metastatic anaplastic thyroid carcinoma (ATC), poorly differentiated thyroid carcinoma (PDTC), or radioactive iodine-refractory differentiated thyroid cancer (RAIR-DTC). Patients with ATC will receive sacituzumab tirumotecan in combination with tislelizumab. Patients with PDTC and RAIR-DTC will receive sacituzumab tirumotecan monotherapy. The primary objective in the ATC cohort is overall survival (OS). In the PDTC and RAIR-DTC cohorts, the primary objective is progression-free survival (PFS) assessed by investigators per RECIST v1.1.

177Lu-LNC1004 Injection, a radiopharmaceutical targeting FAP, has demonstrated preliminary antitumor effect in advanced FAP-positive solid tumor patients. The primary purpose of this study is to evaluate the efficacy of 177Lu-LNC1004 Injection in patients with FAP-positive RAIR-DTC who have failed first-line TKIs treatment or refuse standard treatment. All subjects will receive 80 mCi (± 10%) 177Lu-LNC1004 Injection intravenously every 6 weeks for 2 cycles.