GDF-15 as a biomarker for diagnosis and prognosis of lung cancer: a meta-analysis - Pan, Teng; Duan, Rui; Xu, Zihan; He, Xiaohan; Luo, Xiaojin; Zhou, Guanglin; Song, Yu; Deng, Jinhai; Tan, Xuerui; Wei, Fengxiang (Frontiers in Oncology, 2025)