643 A first in human phase I/IIa trial of personalized tumor-trained lymphocytes, pTTL, derived from regional lymph nodes for treatment of colorectal cancer by Maximilian Kordes, Sofia Berglund, Ola Nilsson, Jeffrey Yachnin, Maziar Nikberg, Abbas Chabok, Erwan Le Maître, Anne-Laure Joly, Luigi Notari, Guro Gafvelin, Hans Grönlund, Kelly Day, Claudia Carvalho-Queiroz, Andreas Kaiser, Mattias Carlsten, Stephan Mielke, Ahmed Salim Tarfy, Andrea Salmén, Samuel Svensson, Hanjing Xie