Immune checkpoint blocking impact and nomogram prediction of COVID-19 inactivated vaccine seroconversion in patients with cancer: a propensity-score matched analysis ===================================================================================================================================================================== * Yifei Ma * Nianqi Liu * Youlong Wang * Jiling Zeng * Ying-Ying Hu * Wu Hao * Huazheng Shi * Pengfei Zhu * Jun Lv * Wei Fan * Xinjia Wang