T cells isolated from patients with checkpoint inhibitor-resistant melanoma are functional and can mediate tumor regression. - Andersen, R; Borch, T H; Draghi, A; Gokuldass, A; Rana, M A H; Pedersen, M; Nielsen, M; Kongsted, P; Kjeldsen, J W; Westergaard, M C W (Annals of Oncology, 2018)