Pre-existing effector T-cell levels and augmented myeloid cell composition denote response to CDK4/6 inhibitor palbociclib and pembrolizumab in hormone receptor-positive metastatic breast cancer ================================================================================================================================================================================================== * Colt Egelston * Weihua Guo * Susan Yost * Jin Sun Lee * David Rose * Christian Avalos * Jian Ye * Paul Frankel * Daniel Schmolze * James Waisman * Peter Lee * Yuan Yuan