KDR and pneumothorax: Moreover, VEGFR-TKI showed a strong signal for pneumothorax (ROR 48.9, 95%CI [34.7–68.9], n = 38; Table 2), particularly for cabozantinib (ROR 104.0, 95%CI [54.8–197.5], n = 11) and lenvatinib (ROR 185.2, 95%CI [99.6–344.4], n = 13).