CDK4/6 inhibition enhances antitumor efficacy of chemotherapy and immune checkpoint inhibitor combinations in preclinical models and enhances T-cell activation in patients with SCLC receiving chemotherapy ============================================================================================================================================================================================================ * Anne Y Lai * Jessica A Sorrentino * Konstantin H Dragnev * Jared M Weiss * Taofeek K Owonikoko * Julie A Rytlewski * Jill Hood * Zhao Yang * Rajesh K Malik * Jay C Strum * Patrick J Roberts