Effect of Intravenous Lidocaine on Serum Interleukin-17 After Video-Assisted Thoracic Surgery for Non-Small-Cell Lung Cancer: A Randomized, Double-Blind, Placebo-Controlled Trial

Purpose: Surgical stress promotes tumor metastasis. Interleukin (IL)-17 plays a pivotal role in cancer progression, and high IL-17 expression predicts poor prognosis of non-small-cell lung cancer (NSCLC). Lidocaine may exert tumor-inhibiting effects. We hypothesize that intravenous lidocaine attenuates surgical stress and reduces serum IL-17 levels during video assisted thoracic surgery (VATS) for NSCLC. Methods: This randomized, double-blind, placebo-controlled trial included 60 early-stage NSCLC patients undergoing VATS, into a lidocaine group (n = 30; intravenous lidocaine bolus 1.0 mg/kg, and 1.0 mg/kg/h until the end of surgery) or a normal saline control group (n = 30). The primary outcome was serum IL-17 level at 24 hours postoperatively. The secondary outcomes included serum IL-17 level at the time of post-anesthesia care unit (PACU) discharge, serum cortisol level at PACU discharge and postoperative 24 hours, pain scores (0-10) from PACU discharge to 48 hours postoperatively, incidences of postoperative nausea and vomiting, dizziness, and arrhythmia during 0-48 hours postoperatively, and 30 day mortality. Long-term outcomes included chemotherapy, cancer recurrence, and mortality. Results: The lidocaine group had lower serum IL-17 at 24 hours postoperatively compared with the control group (23.0 +/- 5.8 pg/mL vs 27.3 +/- 8.2 pg/mL, difference [95% CI] = -4.3 [-8.4 to -0.2] pg/mL; P = 0.038). The lidocaine group also had reduced serum IL-17 (difference [95% CI] = -4.6 [-8.7 to -0.5] pg/mL), serum cortisol (difference [95% CI] = -37 [-73 to -2] ng/mL), and pain scores (difference [95% CI] = -0.7 [-1.3 to -0.1] points) at PACU discharge. During a median follow-up of 10 (IQR, 9-13) months, 2 patients in the lidocaine group and 6 patients in the control group received chemotherapy, one patient in the control group had cancer recurrence, and no death event occurred. Conclusion: Intravenous lidocaine was associated with reduced serum IL-17 and cortisol following VATS procedures in early-stage NSCLC patients. Trial Registration: ChiCTR2000030629.