On June 16, 2022 INmune Bio, Inc. (NASDAQ: INMB) (the "Company"), a clinical-stage immunology company focused on developing treatments that harness the patient’s innate immune system to fight disease, reported that has been invited to present data on reversing resistance to HER2 targeted immunotherapy at the HER2 Targeted Therapy Summit in Boston (Press release, INmune Bio, JUN 16, 2022, View Source [SID1234616042]).

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Mucin 4 (MUC4), a glycoprotein on the cell surface of some epithelial cancers, is an easily measured biomarker in women with breast cancer (BC). MUC4 expression is upregulated by soluble tumor necrosis factor (sTNF) produced by the patient’s breast cancer cells. MUC4 expression predicts worse survival in women with HER2+ BC treated with trastuzumab (p≤0.04) and predicts resistance to trastuzumab and trastuzumab based antibody drug conjugates in pre-clinical models.

Dr. Roxana Schillaci of Instituto de Biología y Medicina Experimental in Buenos Aires and RJ Tesi, M.D. have been invited to give a special joint presentation at noon on June 16 entitled Resistance to Immunotherapy Caused by MUC4 Expression in HER2+ Tumors – Bench to Bedside. The presentation will present both the science driving MUC4-based resistance mechanisms and the translation of these pre-clinical studies to the clinic. A link to the presentation can be found HERE.

Dr. Schillaci, working in collaboration with INmune Bio, has shown in preclinical studies that INB03, a novel DN-TNF biologic that neutralizes soluble TNF, reverses MUC4 expression in HER2+ BC pre-clinical models to reestablish sensitivity to trastuzumab (traz) and trastuzumab ADC (TDM-1). In addition, women with MUC4+/HER2+ BC have a cold tumor with fewer tumor infiltrating lymphocytes (TILs) than women who do not express MUC4 (p=0.018). In a nude mouse model of MUC4+HER2+ BC, the combination of INB03+traz increased the number of activated NK cells (p=0.01) and anti-tumor macrophages (p=0.01) in the tumor microenvironment (TME) and showed anti-tumor macrophage function is more important than NK cell function in controlling tumor growth.

"We have identified three reversable resistance mechanisms in women with HER2+/MUC+ breast cancer – resistance to trastuzumab, resistance to tyrosine kinase inhibitors (eg: lapatinib and tucatinib) and a "cold" immunosuppressive TME. All three resistance mechanisms are driven by soluble TNF produced by the tumor and are reversed by neutralization of soluble TNF in the TME by INB03," said Dr. Schillaci.

"We estimate that resistance to immunotherapy occurs in about a third of women with high, low or ultra-low expression of HER2," added RJ Tesi M.D., CEO of INmune Bio. "As of result of the rapidly changing trastuzumab-based immunotherapy landscape, half of all women with breast cancer are at risk for trastuzmab resistance. MUC4 is a biomarker of resistance that can be determined by staining of patient’s breast cancer biopsy enabling a clinical team to prospectively adjust treatment to potentially improve outcome."

About INB03

INB03 is a DN-TNF inhibitor that neutralizes soluble TNF (sTNF) without affecting transmembrane TNF (tmTNF) or TNF receptors. Compared to currently available non-selective TNF inhibitors, INB03 preserves the immune response to cancer by decreasing immunosuppressive cells in the TME including TAM and MDSC while promoting recruitment of anti-tumor immune cells including cytolytic CD8+ lymphocytes, NK cells and anti-tumor macrophages. INB03 has completed an open label dose-escalation Phase I trial in patients with advanced cancer. In that trial, INB03 was found to be safe and well tolerated – no dose limiting toxicity was found. INB03 decreased blood biomarkers of inflammation in patients with advanced cancer. INMB is planning a Phase II trial that uses IN03 as part of combination therapy. More information about INB03 can be found by clicking here.