On October 5, 2021 I-Mab (Nasdaq: IMAB), a clinical-stage biopharmaceutical company committed to the discovery, development, and commercialization of novel or highly differentiated biologics, and ABL Bio, Inc. (Kosdaq:298380, hereafter "ABL"), a South Korean biotech specializing in bispecific antibody technology, reported that data from the preclinical studies of TJ-CD4B/ABL111 and TJ-L14B/ABL503, will be presented at the Society for Immunotherapy of Cancer (SITC) (Free SITC Whitepaper)’s 36th Annual Meeting (SITC 2021), taking place November 12 – 14, 2021 (Press release, I-Mab Biopharma, OCT 5, 2021, View Source [SID1234590876]).
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Developed in collaboration with ABL, TJ-CD4B/ABL111 and TJ-L14B/ABL503 are part of I-Mab’s highly differentiated bispecific antibody pipeline that target the 4-1BB co-stimulatory molecule on T-cells and mount an anti-tumor response. Both target a highly specific epitope on 4-1BB, which results in localized action and reduced systemic toxicity.
TJ-CD4B/ABL111 engages the Claudin18.2 (CLDB18.2) tumor antigen mainly on gastric and pancreatic cancers to produce localized T-cell activation at the cancer site. It has demonstrated a strong affinity to CLDN18.2-positive cancer cells even at low levels of CLDN18.2 and has potential application in a wide range of cancers. TJ-CD4B/ABL111 is currently undergoing phase 1 trials in the U.S. (NCT04900818) and soon will be in China, in patients with advanced solid tumors, including gastric cancers.
TJ-L14B/ABL503 is a novel bi-specific antibody targeting both PD-L1 and 4-1BB. It engages the PD-L1 molecule on cancer cells and exerts a strong anti-tumor activity through localized activation of T-cells and it is designed to overcome the limited efficacy of anti-PD-L1 therapies and anti-4-1BB-related toxicity. TJ-L14B/ABL503 is currently undergoing a phase 1 clinical trial in the U.S. (NCT04762641) in patients with locally advanced or metastatic solid tumors.
Details of the poster discussion session are as follows:
Abstract Number: 702
Title: TJ-CD4B (ABL111), a Claudin18.2-targeted 4-1BB tumor engager induces potent tumor-dependent immune response without dose-limiting toxicity in preclinical studies
Poster Session: Poster hall, 12-14th November 2021, 7.00 am-5.00 pm
Presenter: Dr. Wenqing Jiang, I-Mab
Abstract Number: 892
Title: ABL503 (TJ-L14B), PD-L1x4-1BB bispecific antibody induces superior anti-tumor activity by PD-L1-dependent 4-1BB activation with the increase of 4-1BB+CD8+ T cells in tumor microenvironment
Poster Session: Poster Hall, 12-14th November 2021, 7.00am-5.00pm
Presenter: Dr. Gihoon You, ABL Bio
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About TJ-CD4B/ABL111
TJ-CD4B, also known as ABL111, is a Claudin 18.2 and 4-1BB bispecific antibody capable of binding to tumor cells expressing Claudin 18.2, i.e., gastric cancer and pancreatic cancer cells, and stimulating intra-tumoral T cells by the 4-1BB arm designed to be activated only upon tumor engagement while silent elsewhere. TJ-CD4B effectively maintains a strong tumor binding property and anti-tumor activity attributable to a synergistic effect of both Claudin 18.2 antibody and 4-1BB antibody while it avoids or minimizes liver toxicity and systemic immunotoxicity commonly seen with 4-1BB antibodies as a drug class. TJ-CD4B is being developed under collaboration between I-Mab and ABL.
About TJ-L14B/ABL503
Being developed jointly with ABL, TJ-L14B/ABL503 is a differentiated PD-L1-based bispecific antibody with the PD-L1 arm as the tumor-dependent T-cell activator and the 4-1BB arm as the conditional T cell activator upon tumor engagement. Using ABL’s "Grabody-T" bispecific antibody platform technology, TJ-L14B/ABL503 stimulates 4-1BB activation only in the presence of PD-L1 expressing tumor cells to minimize the risk of off-tumor toxicity. Preclinical studies have demonstrated that the bispecific antibody shows better anti-tumor activity than equimolar doses of single agents alone or in combination.