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Melanoma clonal heterogeneity leads to secondary resistance after adoptive cell therapy with tumor-infiltrating lymphocytes.
Cancer Immunology Research 2024 April 18
Adoptive cell therapy (ACT) with tumor-infiltrating lymphocytes (TIL) is effective in melanoma patients, although long-term responses seem restricted to patients who have complete remissions. Many patients develop secondary resistance to TIL-ACT but the involved mechanisms are unclear. Here, we describe a case of secondary resistance to TIL-ACT likely due to intratumoral heterogeneity and selection of a resistant tumor cell clone by the transferred T cells. To our knowledge, this is the first case of clonal selection of a pre-existing non-dominant tumor cell clone and it demonstrates a mechanism involved in secondary resistance to TIL-ACT that could potentially change current clinical practice, because it advocates for T-cell collection from multiple tumor sites and analysis of tumor heterogeneity before the treatment with TIL-ACT.
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