The acidic tumor microenvironment enhances PD-L1 expression via activation of STAT3 in MDA-MB-231 breast cancer cells. - Kwon, Yong-Jin; Seo, Eun-Bi; Jeong, Ae Jin; Lee, Song-Hee; Noh, Kum Hee; Lee, Sangsik; Cho, Chung-Hyun; Lee, Chang-Han; Shin, Hyun Mu; Kim, Hang-Rae; Moon, Hyeong-Gon; Ye, Sang-Kyu (BMC Cancer, 2022)