On June 6, 2024 MAIA Biotechnology, Inc., (NYSE American: MAIA) ("MAIA", the "Company"), a clinical-stage biopharmaceutical company developing targeted immunotherapies for cancer, reported Company highlights and key achievements year-to-date, including recent clinical progress for lead candidate THIO, a potential first-in-class cancer telomere targeting agent in clinical development to evaluate its activity in non-small cell lung cancer (NSCLC) (Press release, MAIA Biotechnology, JUN 6, 2024, View Source [SID1234644187]).

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"MAIA’s new science for cancer therapy is driving a powerful value proposition for our portfolio of novel anticancer compounds," said Vlad Vitoc, M.D., MAIA’s Chairman and Chief Executive Officer. "Our most recent clinical data points to THIO’s promising disease control, response rates, and post-therapy patient benefits. Third-line treatment with THIO has significantly outperformed reported standard-of-care data in NSCLC.

"Our confidence in the science and clinical pathways for our immuno-oncology therapies continues to grow," Dr. Vitoc added. "This week at ASCO (Free ASCO Whitepaper) 2024, our poster presentation and prospects for conducting studies in various geographies has generated a wealth of positive response and excitement from U.S. and foreign oncologists and investigators about our growing cancer treatment business."

THIO’s dual mechanism of action is designed to induce telomeric DNA damage and boost cancer-specific immune responses. The Phase 2 THIO-101 clinical trial evaluates THIO sequenced with an immune checkpoint inhibitor (CPI), cemiplimab, in patients with advanced non-small cell lung cancer (NSCLC) who failed two or more standard-of-care therapy regimens prior to THIO dosing. MAIA successfully secured a high value clinical supply agreement for the cemiplimab used throughout the THIO-101 trial.

As of April 30, 2024, THIO-101 data from THIO 180mg + CPI in third-line treatment showed, in part:

– overall response rate (ORR) of 38%
– disease control rate (DCR) of 85%
– median progression-free survival (PFS) of 5.5 months
– median survival follow-up time of 9.1 months

"THIO works well in all doses and has an excellent safety profile, but 180mg has shown the greatest efficacy and is well tolerated compared to existing therapies. Hence, we selected 180mg per cycle as the dose going forward," noted Dr. Vitoc. "For this heavily pre-treated population, comparative third-line data is limited. Checkpoint inhibitor resistant and platinum resistant patients are by far the largest populations with unmet medical needs in NSCLC and are also a substantial part of NSCLC cancer therapy market. We believe that our trial is providing the first real dataset in CPI-resistant patients like this. We are confident about THIO’s prospects for substantially extending patient survival and establishing a new standard of care for cancer.

"We remain steadfast in our goals for responsible access to capital. We have increased our access to cash while keeping dilution to a minimum. We plan to continue this strategy, which has shown desired outcomes so far this year while our share price has more than tripled," added Dr. Vitoc.

MAIA reported cash and current assets of $8.7 million as of March 31, 2024. The Company’s cash position has significantly improved due to approximately $12.4 million in funds raised since February 2024 pursuant to a combination of private placements of our equity securities and sales under our at-the-market offering facility, of which approximately $7.4 million has been raised since April 1, 2024 with $6.4 million of this amount due to sales under the ATM facility to fund continuing clinical development. Our independent directors have shown continued support by investing almost $900,000 in our March and April 2024 private placements with other accredited investors.

MAIA’s Phase 2 THIO-101 clinical trial is expected to near completion in 2024. The Company is also engaged in research and development for a portfolio of second-generation THIO-like compounds.

About THIO

THIO (6-thio-dG or 6-thio-2’-deoxyguanosine) is a first-in-class investigational telomere-targeting agent currently in clinical development to evaluate its activity in Non-Small Cell Lung Cancer (NSCLC). Telomeres, along with the enzyme telomerase, play a fundamental role in the survival of cancer cells and their resistance to current therapies. The modified nucleotide 6-thio-2’-deoxyguanosine (THIO) induces telomerase-dependent telomeric DNA modification, DNA damage responses, and selective cancer cell death. THIO-damaged telomeric fragments accumulate in cytosolic micronuclei and activates both innate (cGAS/STING) and adaptive (T-cell) immune responses. The sequential treatment with THIO followed by PD-(L)1 inhibitors resulted in profound and persistent tumor regression in advanced, in vivo cancer models by induction of cancer type–specific immune memory. THIO is presently developed as a second or later line of treatment for NSCLC for patients that have progressed beyond the standard-of-care regimen of existing checkpoint inhibitors.

About THIO-101, a Phase 2 Clinical Trial

THIO-101 is a multicenter, open-label, dose finding Phase 2 clinical trial. It is the first trial designed to evaluate THIO’s anti-tumor activity when followed by PD-(L)1 inhibition. The trial is testing the hypothesis that low doses of THIO administered prior to cemiplimab (Libtayo) will enhance and prolong immune response in patients with advanced NSCLC who previously did not respond or developed resistance and progressed after first-line treatment regimen containing another checkpoint inhibitor. The trial design has two primary objectives: (1) to evaluate the safety and tolerability of THIO administered as an anticancer compound and a priming immune activator (2) to assess the clinical efficacy of THIO using Overall Response Rate (ORR) as the primary clinical endpoint. Treatment with cemiplimab (Libtayo) followed by THIO has been generally well-tolerated to date in a heavily pre-treated population. For more information on this Phase II trial, please visit ClinicalTrials.gov using the identifier NCT05208944.