579-C Reinvigoration of progenitor-exhausted CD8 T cells by anti-CTLA-4 contributes to the sustained activity of combination checkpoint blockade by Xiaowei Xu, Wei Xu, Alexander Huang, Jeffrey Weber, Andy Minn, Kevin Wang, Tara Mitchell, Sasikanth Manne, Divij Mathew, E John Wherry, Daniel Tenney, Paulina Coutifaris, David Brocks, Sabrina Solis, Nicholas Han, Evgeny Kiner, Chirag Sachar, Sangeeth George, Patrick Yan, Melanie W Kiner, Amy I Laughlin, Shawn Kothari, Josephine R Giles, Rheem Ghinnagow, Cecile Alanio, Ahron Flowers, Ravi K Amaravadi, Giorgos C Karakousis, Lynn M Schuchter, Marcus Buggert, Ramin S Herati