P12.03 Heterotypic CD8 T cell clusters isolated from clinical samples are distinct and enriched for antitumor activity by A George, JBAG Haanen, E Mul, S Pack, S Ibáñez Molero, J Veldman, JJH Traets, K Hoefakker, L Tas, P Alóndiga-Mérida, B van den Broek, R Harkes, M Nieuwland, M van Baalen, S Tol, WJv Houdt, DS Peeper