IN8bio Announces Positive INB-200 Phase 1 Data Update in Glioblastoma at the 2023 ASCO Annual Meeting

• 100% of treated patients (n=8) to date have exceeded historical median progression-free survival, with two patients that received three doses remaining progression-free at 23.5 and 19.4 months, respectively.
• INB-200 continues to exhibit a manageable safety profile with minimal toxicities and repeat dosing demonstrated no change in the toxicity profile.
• Company is on track to complete INB-200 Phase 1 study enrollment in 2023 with updated data expected later this year.
  

NEW YORK, June 05, 2023 (GLOBE NEWSWIRE) -- IN8bio, Inc. (Nasdaq: INAB), a leading clinical-stage biopharmaceutical company focused on innovative gamma-delta T cell therapies, announced updated data from the ongoing Phase 1 clinical trial of INB-200 in patients with newly diagnosed glioblastoma multiforme (GBM). The data were featured as one-of-four oral presentations and the only Phase 1 study during the immunotherapy section of the Central Nervous System Tumors session at the American Society of Clinical Oncology (ASCO) 2023 Annual Meeting in Chicago, Illinois.

“The standard-of-care for GBM over the past twenty years falls short, with a median progression-free survival of just 4 to 7 months and overall survival of only 14 to 16 months. We are thrilled to see that two patients who have received three doses of INB-200 remain progression-free, clinically asymptomatic and off treatment for a prolonged period of time,” said Trishna Goswami, M.D., Chief Medical Officer of IN8bio. “Further, the use of multiple doses in later cohorts have not led to a change in the toxicity profile, which may enable patients to stay on treatment longer and, ultimately, improve outcomes.”

The oral presentation at ASCO includes efficacy and safety data as of a data cutoff of April 30, 2023. Eight patients have been treated with INB-200: three in Cohort 1 (single dose), four in Cohort 2 (three doses) and one in Cohort 3 (six doses). As of May 19, 2023 key findings from the ongoing study include:

• Cohort 1 patients remained progression-free at 8.3, 11.9, and 7.4 months, with respective overall survival (OS) of 15.6, 17.7, and 9.6 months.
• Two patients in Cohort 2 remain alive and progression-free at 23.5 and 19.4 months, respectively, exceeding median OS of GBM patients without progression.
• In Cohort 3, the first patient dosed received five of six planned doses of gamma-delta T cells and had a progression-free survival (PFS) of 7.1 months and OS of 11.8 months with no evidence of additional toxicities. This patient who had an LZRT1 mutation experienced a rare leptomeningeal relapse, along with widespread relapse in their liver, lungs and pelvis. However, there was no progression in their brain, where INB-200 was administered.
• No treatment-related deaths have been reported in any cohort. Six deaths were observed, three due to progression of disease and three unrelated to either treatment or progression (the deaths were due to sepsis, a cardiac event and pulmonary embolism).
• No treatment-related serious adverse events (SAEs), dose-limiting toxicities (DLTs) cytokine release syndrome (CRS), infusion reactions, or immune effector cell-associated neurotoxicity syndrome (ICANS) have been reported in any cohort.
• The most common treatment emergent adverse events (TEAEs) were white blood cell and platelet count decreases related to standard-of-care temozolomide, asthenia, headache and hydrocephalus, mostly Grade 1-2.
• Three additional patients have been consented in Cohort 3 to date and are advancing through treatment.