Case report: pathological complete response in an IIIB non-small cell lung cancer patient after preoperative neoadjuvant nivolumab therapy combined with chemotherapy oleh Luzhen Li, MM, Ting Chen, MM, Huiqin Lai, BD, Ao Zhang, BD, Xianhui Zhao, MM, Jiaming Wu, MM, Huisi Hong, Lexia Wu, BD, Sihong Lin, BD, Kexin Wang, LP, Huatang Zhang, BD, Cantu Fang, BD