Doctor of Medicine, Key Laboratory of Molecular Biology of Infectious Diseases, Ministry of Education, Chongqing Medical University.
Bachelor of Medicine, Oncology Department.
Medicine (Baltimore). 2021 Feb 12;100(6):e24458. doi: 10.1097/MD.0000000000024458.
RATIONALE: The rare BRAF L597Q (c.T1790A) point mutation has been previously reported in childhood acute lymphoblastic leukemia. We present the first rare case of occult papillary thyroid carcinoma with BRAF L597Q mutation in a Tibetan patient. PATIENT CONCERNS: A 57-year-old male patient presented with a protruding mass on the left forehead for 2 years and numbness in the right limb for 3 weeks. DIAGNOSES: The patient had a double mutation of BRAF L597Q and V600E in 2 separate lesions at thyroid and brain, the immunohistochemical staining showed that the cytokeratin (CK), thyroglobulin (Tg) and thyroid transforming factor-1 (TTF-1) were immunoreactive. All the findings supported the diagnosis of solitary brain metastasis of occult papillary thyroid carcinoma. INTERVENTIONS: The patient underwent left frontal lobe metastasis (thyroid cancer) resection that involved craniectomy and artificial skull repair. OUTCOMES: During the 24-month follow-up, no postoperative complications or recurrence and metastasis were found. LESSONS: This is the first case of solitary brain metastasis of occult papillary thyroid carcinoma with double mutation of BRAF L597Q and V600E in 2 separate lesions reported in the literature. Our study extends the disease spectrum of occult papillary thyroid carcinoma and suggests that the BRAF L597Q mutation might play a specific role in inducing the solitary brain metastasis of occult papillary thyroid carcinoma in a Chinese Tibetan patient, but the detailed molecular mechanism remains to be confirmed by a large number of functional experiments and clinical research.
背景:BRAF L597Q(c.T1790A)点突变在儿童急性淋巴细胞白血病中已有报道。我们报告首例藏人隐匿性甲状腺乳头状癌伴 BRAF L597Q 突变的罕见病例。
病例介绍:一名 57 岁男性患者,因左额部突出肿块 2 年,右侧肢体麻木 3 周就诊。
诊断:患者甲状腺和脑部各有一处 BRAF L597Q 和 V600E 双突变,免疫组化染色显示细胞角蛋白(CK)、甲状腺球蛋白(Tg)和甲状腺转录因子-1(TTF-1)阳性。所有结果均支持孤立性脑转移隐匿性甲状腺乳头状癌的诊断。
干预:患者行左额叶转移灶(甲状腺癌)切除术,包括开颅术和人工颅骨修复术。
结果:在 24 个月的随访中,未发现术后并发症或复发转移。
结论:这是首例文献报道的藏人隐匿性甲状腺乳头状癌伴 BRAF L597Q 和 V600E 双突变的孤立性脑转移病例。我们的研究扩展了隐匿性甲状腺乳头状癌的疾病谱,并提示 BRAF L597Q 突变可能在诱导藏人隐匿性甲状腺乳头状癌的孤立性脑转移中发挥特定作用,但详细的分子机制仍需大量功能实验和临床研究来证实。
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