Use of crizotinib as neoadjuvant therapy for non-small cell lung cancers patient with ROS1 rearrangement: A case report.

Crizotinib showed significant antitumor effect in patients with advanced ROS1-rearranged non-small cell lung cancers (NSCLC). Most recently, many studies have explored the feasibility and efficacy of target therapy for perioperative application in NSCLC. Here, we describe a female patient who was diagnosed with stage IIIB lung adenocarcinoma exhibiting a CCDC6-ROS1 rearrangement by high-throughput sequencing. The tumor and lymph nodes showed durable response after the treatment of crizotinib. Given that a radiological downstaging was indicated, a right lower lobectomy and systemic lymphadenectomy were successfully performed. The pathological response was 60% and the tumor, nodes, and metastases (TNM) stage was ypT2bN0M0. The PD-L1 expression and activity of immunological cells were also investigated.