TGFB2 and hepatocellular carcinoma: 'Circ-SPECC1 Modulates TGFβ2 and autophagy under oxidative stress by sponging miR-33a to promote hepatocellular carcinoma tumorigenesis' by Bin Zhang, Zhiyi Liu, Kuan Cao, Wengang Shan, Jin Liu, Quan Wen, Renhao Wang, Cancer Med 2020, 9: 5999-6008.