Immune checkpoint blockade (ICB) therapy has revolutionized head and neck squamous cell carcinoma (HNSCC) treatment, but <20% of patients achieve durable responses. Persistent activation of the PI3K/AKT/mTOR signaling circuitry represents a key oncogenic driver in HNSCC; however, the potential immunosuppressive effects of PI3K/AKT/mTOR inhibitors may limit the benefit of their combination with ICB. Here we employ an unbiased kinome-wide siRNA screen to reveal that HER3, is essential for the proliferation of most HNSCC cells that do not harbor PIK3CA mutations. Indeed, we find that persistent tyrosine phosphorylation of HER3 and PI3K recruitment underlies aberrant PI3K/AKT/mTOR signaling in PIK3CA wild type HNSCCs. Remarkably, antibody-mediated HER3 blockade exerts a potent anti-tumor effect by suppressing HER3-PI3K-AKT-mTOR oncogenic signaling and concomitantly reversing the immune suppressive tumor microenvironment. Ultimately, we show that HER3 inhibition and PD-1 blockade may provide a multimodal precision immunotherapeutic approach for PIK3CA wild type HNSCC, aimed at achieving durable cancer remission.

/pdf/disruption-of-the-her3-pi3k-mtor-oncogenic-signaling-axis-24cl2rwmmu.pdf

Disruption of the HER3-PI3K-mTOR oncogenic signaling axis and PD-1 blockade as a multimodal precision immunotherapy in head and neck cancer.

TPS6091Background: ErbB3 (HER3) and its ligand, neuregulin-1 (NRG1), are widely expressed in HNSCC and associated with tumor progression. ErbB3 may provide a key mechanism of resistance to therapie...

A phase 2, multicenter, open-label study to evaluate the efficacy and safety of CDX-3379 in combination with cetuximab in patients with advanced head and neck squamous cell carcinoma (HNSCC).

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A phase 2, multicenter, open-label study to evaluate the efficacy and safety of CDX-3379 in combination with cetuximab in patients with advanced head and neck squamous cell carcinoma (HNSCC).