Abstract 3534: Forecasting oncogene amplification and tumor suppressor deletion

Abstract Oncogene amplification and tumor suppressor deletion can drive tumor initiation, progression and treatment resistance. Detection at diagnosis often signals poor prognosis, but it can also enable opportunities for treatment with highly effective targeted therapies. Predicting the likelihood that a patient will acquire these driver alterations in the future using a genomic test represents an opportunity to realize the benefits of interventions earlier, potentially with preventative intent. Here, we present a forecasting framework that takes as input a DNA copy number profile and predicts whether the tumor will acquire an oncogene amplification or tumor suppressor deletion in the future. This framework leverages mutation rate estimates from the input tumor, alongside gene-specific selection coefficients derived from a large cohort of 7,880 tumors. We demonstrate feasibility using 7,042 single-time-point samples and longitudinally collected tumor pairs from 44 prostate and 100 lung cancers, identifying tumors that went on to acquire amplifications at a later time point with an average AUC of 0.87. We show potential clinical utility by forecasting poor prognosis in low-grade gliomas via CDK4/PDGFRA amplification or CDKN2A deletion, and osimertinib resistance in lung cancers via MET amplification. This study serves as a proof-of-concept for a new class of biomarker, wherein selective pressures and mutation-generating processes can be harnessed to anticipate future genomic alterations. Citation Format: Barbara Hernando, Angel Fernandez-Sanroman, Alice Cadiz, Patricia Santamaria, David Gomez Sanchez, Maria Escobar-Rey, Blas Chaves-Urbano, Joe Thompson, Marina Torres, Gorka Ruiz de Garibay, Vera Adradas, Eva Álvarez, The Pan Prostate Cancer Group, Maxime Tarabichi, Tom Lesluyes, Juan Manuel Coya, Jon Zugazagoitia, Luis G. Paz-Ares, Geoff Macintyre. Forecasting oncogene amplification and tumor suppressor deletion [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2026; Part 1 (Regular Abstracts); 2026 Apr 17-22; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2026;86(7 Suppl):Abstract nr 3534.