Selpercatinib Before Surgery for the Treatment of RET-Altered Thyroid Cancer

Inclusion Criteria: * Patients with RET-altered thyroid cancer who present with locally advanced primary tumor, defined as T3 or T4 by imaging or invasive/bulky nodal disease, or with recurrent/residual invasive/bulky nodal disease will be enrolled in this trial, regardless of whether distant metastases are present or not * At least 12 years of age on the day of signing informed consent * Pathologic findings supporting the clinical impression of medullary thyroid carcinoma, papillary thyroid carcinoma, poorly differentiated thyroid carcinoma, or anaplastic thyroid carcinoma. Diagnosis of anaplastic thyroid carcinoma may include consistent with or suggestive of terminology associated with: anaplastic thyroid carcinoma, undifferentiated carcinoma, squamous carcinoma; carcinoma with spindled, giant cell, or epithelial features; poorly differentiated carcinoma with pleomorphism, extensive necrosis with tumor cells present * Having an activating RET gene alteration (fusion or mutation). The RET alteration result should be generated from a laboratory with Clinical Laboratory Improvement Act (CLIA), ISO/EIC, College of American Pathologists (CAP), or other similar certification that clearly denotes the presence of a RET alteration in tumor, or institutional-approved cell free DNA blood test for RET alteration * Prior multikinase inhibitors (MKIs) with anti-RET activity are allowed. The specific agent(s), duration of treatment, clinical benefit, and reason for discontinuation (e.g.,…