Spermine accumulation via spermine synthase promotes tumor cell proliferation in head and neck squamous cell carcinoma. - Chen, Xi; Song, Fei; Xiao, Peng; Yao, Yisong; Li, Dongxian; Fang, Yuhui; Lv, Shijun; Mou, Yakui; Li, Yumei; Song, Xicheng (BMC Cancer, 2025)