Abstract LB128: Mapping genomically classified molecular clusters to therapeutic outcomes in a pan-Indian lung cohort: A strategy for smarter clinical trial randomization

Abstract Background: Lung cancers exhibit extensive genomic heterogeneity, yet clinical trial randomization commonly relies on broad histologic or single-driver classifications, potentially obscuring mechanistically distinct subgroups with differential therapeutic responses. There is a need to define reproducible, genomically informed clusters that integrate co-alteration patterns and pathway-level signals to better align patients with targeted and combination strategies. Methods: A real-world clinico-genomic lung cancer dataset was curated from 5000 Indian patients undergoing comprehensive next-generation sequencing, including single-nucleotide variants, indels, copy-number alterations, and fusions across key oncogenic pathways. Tumors were first grouped into genomically defined cohorts based on dominant driver events (for example EGFR, ALK, KRAS, MET, RET, BRAF, ERBB2, and oncogene-negative), then further stratified by co-mutation signatures, tumor suppressor loss, DNA damage and cell-cycle alterations, and pathway activation patterns. Unsupervised clustering and network analysis were applied to identify higher-order molecular mechanism clusters, which were then linked to prior treatment exposures and observed clinical outcomes where available. Results: Distinct clusters emerged within and across canonical driver-defined cohorts, characterized by recurrent constellations of alterations involving DNA repair, cell-cycle control, PI3K-AKT-mTOR, RAS-MAPK, and apoptotic pathways. Several clusters showed enrichment for therapeutic resistance-associated features, including concurrent TP53, RB1, or CDKN2A/B loss in EGFR- and ALK-driven tumors, and convergent bypass signalling alterations in KRAS- and MET-driven disease. Integration of longitudinal treatment histories suggested that these mechanistic clusters correlated with differences in progression patterns and durability of response to targeted therapies and taxane- or platinum-based backbones, supporting their potential utility as strata for trial enrolment and adaptive randomization. Conclusions: Systematic analysis of genomically classified lung cancer cohorts can reveal mechanistically coherent molecular clusters that transcend single-driver labels and may better predict therapeutic trajectories. Incorporating such clusters into trial design may refine eligibility, reduce biological heterogeneity within arms, and enable more informative comparisons of targeted and combination regimens. These insights derived from an Indian population will be very valuable for multicentric trial designs. These findings support further validation of cluster-based randomization frameworks and their integration into AI-enabled clinico-molecular platforms for precision oncology trials. Citation Format: Vidya Veldore, Giridharan Periyasamy, Anjali Kulkarni, Chirantan Bose, Kumar Prabhash, Supriya Goud, Akhil Kapoor, Satya Narayan Sarswat, Kaushal Kalra, Rup Jyoti Sarma, Surender Beniwal, Hitesh Goswami, Kshitij Datta Rishi, Prabakar Sampath, Praveen Kumar Jha, Rahul Kumar. Mapping genomically classified molecular clusters to therapeutic outcomes in a pan-Indian lung cohort: A strategy for smarter clinical trial randomization abstract. In: Proceedings of the American Association for Cancer Research Annual Meeting 2026; Part 2 (Late-Breaking, Clinical Trial, and Invited Abstracts) ; 2026 Apr 17-22; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2026;86 (8Suppl): Abstract nr LB128.