ArticleClinical cancer research : an official journal of the American Association for Cancer Research2026
PI3Kα Inhibitor and Degrader Inavolisib Can Co-opt FGFR2 to Enhance Responses in Patients with PIK3CA-Mutated Solid Tumors and in Preclinical Models.
Article in Clinical cancer research : an official journal of the American Association for Cancer Research, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT03006172 (A Phase I, Open-Label, Dose-Escalation Study Evaluating the Safety, Tolerability, and Pharmacokinetics of GDC-0077 as a Single Agent in Patients With Locally Advanced or Metastatic PIK3CA-Mutant Solid Tumors and in Combination With Endocrine and Targeted Therapies in Patients With Locally Advanced or Metastatic PIK3CA-Mutant Breast Cancer), which is not on this map. Cited by 1 paper.
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Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
A Phase I, Open-Label, Dose-Escalation Study Evaluating the Safety, Tolerability, and Pharmacokinetics of GDC-0077 as a Single Agent in Patients With Locally Advanced or Metastatic PIK3CA-Mutant Solid Tumors and in Combination With Endocrine and Targeted Therapies in Patients With Locally Advanced or Metastatic PIK3CA-Mutant Breast Cancer
Who cites it
1 citing paper in PubMed.
- Targeted protein degradation dismantles undruggable targets to reverse immune evasion and therapy resistance in cancer.Frontiers in immunology · 2026Review
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46 authors.
Funding
Abstract
purposePIK3CA mutations frequently drive solid tumors, particularly hormone receptor-positive breast cancer. Inavolisib, an ATP-competitive p110α inhibitor, also promotes the degradation of mutated p110α. PI3K inhibitors have generally shown modest single-agent activity and have safety concerns. PATIENTS AND
methodsA first-in-human phase 1 study (NCT03006172) evaluated oral inavolisib in patients with PIK3CA-mutated solid tumors to determine the maximum tolerated dose and safety. Correlative analyses included ctDNA. Preclinical studies in cell lines and xenografts elucidated the role of FGFR2.
resultsThe maximum tolerated dose was 9 mg daily, with a manageable safety profile (e.g., hyperglycemia and diarrhea). Inavolisib showed linear pharmacokinetics, consistent pharmacodynamic modulation, and antitumor activity in hormone receptor-positive PIK3CA-mutated breast cancer (26% objective response rate and 45% clinical benefit rate). FGFR2 hotspot mutations in ctDNA were strongly associated with clinical benefit. Preclinically, oncogenic FGFR2 signaling enhanced inavolisib sensitivity by engaging HER3, RAS, and p85β, that facilitated mutated p110α degradation, surpassing nondegrading inhibitors. Combination therapy with FGFR2 inhibitors showed synergy and delayed resistance.
conclusionsThese findings highlight a novel cooperativity between FGFR2 and p110α that boosts the effectiveness of inavolisib. The data support advancing precision oncology beyond single biomarkers to complex algorithms utilizing co-occurring alterations, suggesting that combining inavolisib with FGFR2 inhibitors may offer enhanced and more durable responses in PIK3CA/FGFR2-altered tumors.
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