KRAS inhibition is an effective therapy for appendiceal adenocarcinoma

Appendiceal adenocarcinoma (AA) is a rare cancer with limited treatment options. KRAS is the most commonly mutated gene in AA and a promising therapeutic target, but its preclinical and translational relevance in AA remains unclear.

We evaluated KRAS^G12D-specific (MRTX1133) and pan-KRAS inhibitor (RMC-6236) in KRAS^mut organoid and PDX models of AA. Tumor-intrinsic and microenvironmental responses were characterized using multi-omics profiling. Clinical outcomes were also assessed in cohort of 15 patients with AA treated with KRAS inhibitors.

MRTX1133 was highly effective for KRAS^G12D organoids (IC50 = 4.1 nM); both KRAS^G12D and KRAS^G12V organoids were sensitive to RMC-6236 (IC50 = 4.4 nM vs. 0.5 nM, respectively). In PDX models of peritoneal carcinomatosis from AA, MRTX1133 reduced tumor growth in the KRAS^G12D model TM00351, and RMC-6236 reduced tumor growth in KRAS^G12V model AAPDX-16. Pathologic evaluation showed dramatically reduced tumor cellularity, proliferation, and pERK expression as well as induction of apoptosis. Gene Set Enrichment Analysis (GSEA) demonstrated consistent downregulation of E2F targets and RAS/ERK signaling across both models, confirming on-target KRAS inhibition, alongside upregulation of EMT (Epithelial-to-Mesenchymal Transition), suggesting a shared resistance-associated transcriptional program. Interferon-alpha and interferon-gamma signaling were significantly upregulated following pan-KRAS inhibition, implicating TME (Tumor Microenvironment) immunomodulation as a downstream consequence of KRAS inhibition in AA. scRNA-seq analysis of the TME showed a dramatic shift from normal to inflammatory cancer-associated fibroblasts (CAFs) following KRAS inhibition. Upregulation of interferon alpha and gamma pathways was also observed, suggesting that KRAS inhibition can activate innate immune response in the setting of peritoneal metastases. Among 15 patients treated with KRAS inhibitors (8 G12D, 5 G12C, 2 pan-KRAS), all evaluable pateints had a biochemical response by serum markers and clinical benefit by imaging criteria (1 CR, 1 PR, 12 SD).

While effective suppression of RAS/ERK signaling by KRAS inhibitors reduces tumor growth, adaptive activation of EMT pathway may mediate resistance in KRAS^mut AA. Additionally, KRAS inhibition remodels TME and may enhance innate immune signaling. These findings support the continued clinical development of KRAS inhibitors in AA and provide a rationale for combination strategies targeting resistance pathways and stromal remodeling.