Article
Case Report: Evolution of a BRAF V600E-mutant papillary thyroid carcinoma from latissimus dorsi metastasis and squamous transformation to PD-L1 upregulation and effective immunotherapy.
Frontiers in immunology - 1 Jan 2026
Tian Dan, Deng Shuqin, Jin Gaowa, Da Lenggaowa, Wang Wenjuan, Wu Yungaowa, Gao Jiali, Xu Ting, Wei Kexin, Han Yalong, Zhao Jun, Li Quanfu
Abstract excerpt
This case report describes an unusual clinical course of a patient with papillary thyroid carcinoma (PTC). The patient sequentially developed metastases to the cervical lymph nodes, lungs, pleura, and brain. Following tumor invasion into the latissimus dorsi muscle, a biopsy of this metastatic lesion revealed a BRAF V600E-mutant squamous cell carcinoma (SCC) phenotype indicating a high-grade dedifferentiation...
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