OBI Pharma Announces Phase 2 Studies Patient Enrollment for OBI-999 and OBI-3424

Solid tumor patients with high Globo H or AKR1C3 expression will be enrolled.

TAIPEI, Taiwan, Jan. 24, 2022 /PRNewswire/ -- OBI Pharma, a Taiwan biopharma company (TPEx: 4174), today announced that the first patients have been enrolled in both of the Phase 2 studies of OBI-999, an antibody drug conjugate (ADC) cancer therapy targeting Globo H, and OBI-3424, a prodrug targeting the enzyme aldo-keto reductase 1C3 (AKR1C3).

The Phase 2 cohort expansion part of the OBI-999-001 (ClinicalTrials.gov Identifier: NCT04084366) entitled "A Phase 1/2, Open-Label, Dose-Escalation and Cohort-Expansion Study Evaluating the Safety, Pharmacokinetics, and Therapeutic Activity of OBI-999 in Patients with Advanced Solid Tumors" has now begun enrollment. The Phase 2 part of the study will enroll Globo H expressing patients with pancreatic, colorectal and other high Globo H expression solid tumors in more than ten medical centers in the United States and Taiwan.

The Phase 2 cohort expansion part of the OBI-3424-001 (ClinicalTrials.gov Identifier: NCT03592264) entitled "A Phase 1/2 Study of OBI-3424 in Subjects with Advanced Solid Tumors" has also begun enrollment. This study will enroll AKR1C3 expressing patients with pancreatic and other high AKR1C3 expressing solid tumors in select oncology medical centers in the United States.

OBI's Chairman and Chief Executive Officer, Michael Chang, PhD, noted "OBI Pharma strives to develop novel therapeutics for cancer patients worldwide. Based upon the impressive Phase 1 safety study and preclinical data of OBI-999 and OBI-3424, we are excited to commence our Phase 2 efficacy and safety study in patients with high Globo H or AKR1C3 antigen expression in solid tumors. We would like to thank the commitment of our international investigators to bring these 1st-in-class cancer therapeutic products to potential patients in our ongoing study."

OBI anticipates completing the enrollment of both Phase 2 studies in the second half of 2023.

About OBI-999

OBI-999 is a novel first-in-class Antibody Drug Conjugate (ADC) with a proprietary linker technology that provides a consistent Drug-to-Antibody ratio (DAR) for cancer treatment that is based on Globo H, an antigen expressed in up to 15 epithelial cancers. OBI-999 uses a Globo H antibody to target cancer cells of high Globo H expression. By releasing a small molecule chemotherapeutic drug through the specificity of the antibody, it directly deploys cytotoxic therapy at the targeted cancer cells. In pre-clinical xenograft animal models in multiple tumor types (gastric, pancreatic, lung and breast), OBI-999 has demonstrated profound tumor shrinkage at various doses. In human Phase 1 study, OBI-999 was well-tolerated, and achieved a favorable safety margin which warrants further clinical development. OBI-999 is currently in a Phase 2 clinical trial (ClinicalTrials.gov Identifier: NCT04084366) in medical centers in the US and Taiwan. OBI Pharma owns global rights to OBI-999.

About OBI-3424

OBI-3424 is a first-in-class novel small-molecule prodrug that selectively targets cancers overexpressing the enzyme aldo-keto reductase 1C3 (AKR1C3), and selectively releases a potent DNA alkylating agent in the presence of the AKR1C3 enzyme. This selective mode of activation distinguishes OBI-3424 from traditional alkylating agents, such as cyclophosphamide and ifosfamide, which are non-selective.

AKR1C3 overexpression has been documented in a number of treatment-resistant and difficult-to-treat cancers including hepatocellular carcinomas (HCC), castrate-resistant prostate cancer (CRPC), and T-cell acute lymphoblastic leukemia (T-ALL). AKR1C3 is highly expressed in up to 15 solid and liquid tumors.

Furthermore, individualized patient selection by staining for AKR1C3 overexpression by immunohistochemistry can be performed based on tumor biopsies or circulating tumor cells to identify patients with other tumor types most likely to respond to treatment with OBI-3424, and thus offering the possibility for a streamlined clinical development strategy.

OBI-3424 is currently in a Phase 2 trial (ClinicalTrials.gov Identifier: NCT03592264) in medical centers in the US. OBI owns global rights to OBI-3424 except the Asia Pacific region.

About OBI Pharma

OBI Pharma, Inc., is a Taiwan biopharmaceutical company that was established in 2002. Its mission is to develop and license novel therapeutic agents for unmet medical needs against cancer targets such as Globo Series (including Globo H, SSEA-3 and SSEA-4), AKR1C3, and other promising targets.

The company's novel first-in-class immuno-oncology portfolio against Globo H includes: Adagloxad Simolenin (formerly OBI-822) and OBI-833, a Globo H active immunotherapy vaccine; OBI-888 (Globo H mAb) and OBI-999 (Globo H ADC). The company's novel first-in-class AKR1C3 targeted therapy is OBI-3424 (small-molecule prodrug) that selectively releases a potent DNA alkylating agent in the presence of the aldo-keto reductase 1C3 (AKR1C3) enzyme. Additional information can be found at www.obipharma.com.

Forward-Looking Statements

Statements included in this press release that are not a description of historical facts are forward-looking statements within the meaning of the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. Such forward-looking statements include, but are not limited to, statements about future clinical trials, results and the timing of such trials and results. Such risk factors are identified and discussed from time to time in OBI Pharma's reports and presentations, including OBI Pharma's filings with the Taiwan Securities and Futures Bureau. OBI Pharma has no obligation to update or revise any forward-looking statements, whether because of new information, future events, or otherwise.

COMPANY CONTACT:
Kevin Poulos
OBI Pharma USA, Inc.
+1 (858) 731-6706
kpoulos@obipharmausa.com