Is needle biopsy a risk factor of pleural recurrence after surgery for non-small cell lung cancer?

Background Tumor seeding, whereby malignant cells are deposited along the needle tract, is considered to be a potential hazard of needle biopsies. The aim of this study is to elucidate the relationship between needle biopsies for lung tumor, such as a preoperative computed tomography-guided needle biopsy (PCTGNB) or an intraoperative fine-needle aspiration biopsy (IFNAB), and ipsilateral pleural recurrence (PR) after lung cancer surgery. Methods Between 2008 and 2017, 1,047 patients with non-small cell lung cancer (NSCLC) underwent curative lung resection in our institution. They were divided into two groups: those in whom the first recurrent site was the ipsilateral pleural cavity (PR group) and the others (control group). Risk factors of PR were investigated retrospectively. Results Recurrence was observed in 191 patients (18.2%), 25 of whom were categorized to the PR group (17 malignant effusion, 10 dissemination). Pathological tumor [2-4], lymph nodes [1-2], pleural, lymphatic and vascular invasion (each ≥1) factors and patients who underwent PCTGNB were more frequently observed in the PR group than in the control group (each P<0.01) whereas the proportion of patients who underwent IFNAB was not significant. A multivariate analysis identified pathological lymph node factor and the frequency of PCTGNB as independent risk factors for PR with hazard ratios of 7.33 (95% CI, 2.93-19.8; P<0.01) and 6.92 (95% CI, 2.25-17.8; P<0.01), respectively. Conclusions PCTGNB is a risk factor of PR but IFNAB is not. Indications for PCTGNB should be carefully determined.