Tyrosine Kinase Inhibitor Therapy in Locally Advanced Differentiated Thyroid Cancer: A Case Report

A 73-year-old female presenting with haemoptysis and dyspnoea was found to have a locally advanced left thyroid mass and vocal cord palsy. A CT scan of the neck and thorax and endoscopy demonstrated invasion into the tracheal lumen. Histopathology of the intraluminal tracheal mass confirmed a papillary thyroid cancer (PTC). The tumour was deemed unresectable due to local extent and patient comorbidities. TKI therapy with lenvatinib was used for 14 months. On serial scanning, a marked reduction in tumour volume from 31 x 59 x 32 mm to 17 x 28 x 22 mm was noted. This subsequently allowed a successful surgical resection with a total thyroidectomy and central neck dissection with no evidence of residual macroscopic disease. Histopathology confirmed a well-differentiated PTC with features of tumour regression. In this case, TKI therapy in a locally advanced unresectable DTC reduced tumour size and infiltration to a degree that surgical resection of macroscopic disease was possible, without requiring airway resection. This raises the possibility that TKIs may have a neoadjuvant role in selected cases of locally advanced DTC to reduce tumour volume and therefore morbidity of subsequent surgical resection. (C) 2019 European Thyroid Association Published by S. Karger AG, Basel