The MATRiX trial: A multicenter, randomized, phase II study of ATR inhibition (via tuvusertib) with or without avelumab in patients with advanced anti-PD-(L)1–refractory Merkel cell carcinoma.
Bhakuni R, Hall E, Ansstas G, Bhatia S, Brohl A, Burgess M, Dimitrova M, Gao L, Ishizuka J, Lipson E, Lutzky J, Silk A, Yun J, Brownell I, Murray J, Mowery Y, Gooley T, Gore S, Topalian S, Nghiem P. The MATRiX trial: A multicenter, randomized, phase II study of ATR inhibition (via tuvusertib) with or without avelumab in patients with advanced anti-PD-(L)1–refractory Merkel cell carcinoma. Journal Of Clinical Oncology 2025, 43 DOI: 10.1200/jco.2025.43.16_suppl.tps9598.Peer-Reviewed Original ResearchMerkel cell carcinomaProgression-free survivalCell carcinomaProgressive diseaseATR inhibitionDay 1PD-1 pathway inhibitorsRare neuroendocrine skin cancerRecommended phase II doseAnti-tumor immune responseTreatment-emergent adverse eventsKi-67 proliferative indexPD-(L)1 blockadePhase II doseResponse Evaluation CriteriaPhase II studySolid tumor immunotherapyInduce tumor regressionNeuroendocrine skin cancerPhase I trialLog-rank testMerkel cell polyomavirusHigh response rateCell cycle checkpoint regulationII dose
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