On May 3, 2023 Immix Biopharma, Inc. (Nasdaq: IMMX) ("ImmixBio", "Company", "We" or "Us"), a biopharmaceutical company pioneering Tissue-Specific Therapeutics (TSTx)TM targeting oncology and immuno-dysregulated diseases, reported positive early interim clinical trial data: 100% Tumor Shrinkage at 2-months in advanced metastatic colorectal cancer demonstrated by IMX-110 + BeiGene / Novartis anti-PD-1 antibody tislelizumab combination in the first cohort of patients (two out of two first evaluable patients) who received the lowest IMX-110 dose in its ongoing dose escalation 1b/2a clinical trial of IMX-110 + anti-PD-1 antibody tislelizumab (IMMINENT-01), as of the April 14, 2023 data cutoff date (Press release, Immix Biopharma, MAY 3, 2023, View Source [SID1234630920]).

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"We are excited to see 100% tumor shrinkage in the very first cohort at the lowest dose of IMX-110 in combination with anti-PD-1 antibody tislelizumab in our ongoing IMMINENT-01 dose escalation trial, especially in patients with advanced colorectal cancer, who have limited treatment options," said Ilya Rachman, MD PhD, CEO of ImmixBio. "These initial results potentially validate the scientific rationale for the promise of IMX-110 to unlock our immune system’s ability to fight cancer."

Dosing of the first cohort of three advanced metastatic colorectal cancer patients is complete, as of April 14, 2023, for the ongoing Phase 1b portion of the IMMINENT-01 Phase 1b/2a clinical trial investigating IMX-110 in combination with BeiGene / Novartis anti-PD-1 antibody tislelizumab in advanced solid tumors, including colorectal cancer. No dose limiting toxicities have been observed in the first cohort, which means that the trial can now enroll the next cohort of three patients at a higher dose of IMX-110 in combination with anti-PD-1 antibody tislelizumab. Tumor shrinkage was observed in the first two out of two (2/2) evaluable patients (100%) at 2-months. To put this early interim clinical data in perspective, anti-PD-1 antibody pembrolizumab alone (marketed as KEYTRUDA by Merck) produced tumor shrinkage in 3 of 19 patients (16%) with an evaluable postbaseline tumor assessment in a Phase 1b study of pembrolizumab in patients with advanced or metastatic colorectal cancer according to O’Neil, et al., 2017. This study was not a head-to-head evaluation with IMX-110 and differences exist between trial designs, subject characteristics, and caution should be exercised when evaluating clinical data across studies.

The PD-1/PD-L1 antibody market size is approximately $49.5 billion in 2023 and expected to reach $123.3 billion by 2033 according to Future Market Insights.

The colorectal cancer market is estimated to reach approximately $31.2 billion by 2025 from the estimated $26.3 billion in 2019 according to IndustryARC.

About IMMINENT-01
IMMINENT-01 is a first-of-its-kind, ongoing phase 1b/2a clinical trial combining tissue specific therapeutic IMX-110 with BeiGene / Novartis’ anti-PD-1 antibody tislelizumab, in patients with advanced solid tumors. The novel approach combining TSTx IMX-110 with anti-PD-1 antibody tislelizumab is designed to expand the population of cancer patients experiencing extended remissions from immunotherapies by converting immunologically "cold" tumors "hot".

In Phase 1b of IMMINENT-01, cohorts of 3 patients will receive escalating doses of IMX-110 until the maximum tolerated dose is reached and the recommended phase 2 dose is determined.

Phase 2a will then begin, treating patients in certain solid tumor indications selected based on Phase 1b clinical data collected in a variety of tumor types. 30 patients are expected to be enrolled in IMMINENT-01.

The primary endpoints of IMMINENT-01 are to identify the maximum tolerated dose and recommended Phase 2 dose of IMX-110 + anti-PD-1 antibody tislelizumab, and to evaluate safety. The secondary endpoints of IMMINENT-01 are to evaluate the pharmacokinetics and preliminary efficacy of IMX-110 + anti-PD-1 antibody tislelizumab.

As of the data cutoff of April 14 2023, the first cohort dosing at the lowest dose of IMX-110 + anti-PD-1 antibody tislelizumab has reached full enrollment.

Immix Biopharma is currently enrolling the next higher dose cohort of IMX-110 + anti-PD-1 antibody tislelizumab in advanced solid tumors.

About Colorectal Cancer

According to American Cancer Society, there were roughly 153,020 new cases of colorectal cancer in the United States in 2023. Globally, there are roughly 1,930,000 new cases of colorectal cancer each year, of which 519,500 are in Europe, 148,500 are in Japan, 20,500 are in Australia and New Zealand, and 555,000 are in China. The five-year survival rate in the United States for advanced metastatic CRC is 15.6% according to NIH SEER.