Article ; Online: ADCT-602, a Novel PBD Dimer-containing Antibody-Drug Conjugate for Treating CD22-positive Hematologic Malignancies.
2024 Volume 23, Issue 4, Page(s) 520–531
Abstract: Relapsed or refractory B-cell acute lymphoblastic leukemia (R/R B-ALL) and lymphomas have poor patient outcomes; novel therapies are needed. CD22 is an attractive target for antibody-drug conjugates (ADCs), being highly expressed in R/R B-ALL with rapid ... ...
Abstract | Relapsed or refractory B-cell acute lymphoblastic leukemia (R/R B-ALL) and lymphomas have poor patient outcomes; novel therapies are needed. CD22 is an attractive target for antibody-drug conjugates (ADCs), being highly expressed in R/R B-ALL with rapid internalization kinetics. ADCT-602 is a novel CD22-targeting ADC, consisting of humanized mAb hLL2-C220, site specifically conjugated to the pyrrolobenzodiazepine dimer-based payload tesirine. In preclinical studies, ADCT-602 demonstrated potent, specific cytotoxicity in CD22-positive lymphomas and leukemias. ADCT-602 was specifically bound, internalized, and trafficked to lysosomes in CD22-positive tumor cells; after cytotoxin release, DNA interstrand crosslink formation persisted for 48 hours. In the presence of CD22-positive tumor cells, ADCT-602 caused bystander killing of CD22-negative tumor cells. A single ADCT-602 dose led to potent, dose-dependent, in vivo antitumor activity in subcutaneous and disseminated human lymphoma/leukemia models. Pharmacokinetic analyses (rat and cynomolgus monkey) showed excellent stability and tolerability of ADCT-602. Cynomolgus monkey B cells were efficiently depleted from circulation after one dose. Gene signature association analysis revealed IRAK1 as a potential marker for ADCT-602 resistance. Combining ADCT-602 + pacritinib was beneficial in ADCT-602-resistant cells. Chidamide increased CD22 expression on B-cell tumor surfaces, increasing ADCT-602 activity. These data support clinical testing of ADCT-602 in R/R B-ALL (NCT03698552) and CD22-positive hematologic cancers. |
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MeSH term(s) | Humans ; Rats ; Animals ; Immunoconjugates/pharmacology ; Immunoconjugates/therapeutic use ; Macaca fascicularis ; Antineoplastic Agents/therapeutic use ; Lymphoma, B-Cell/drug therapy ; Hematologic Neoplasms/drug therapy ; Sialic Acid Binding Ig-like Lectin 2 |
Chemical Substances | Immunoconjugates ; Antineoplastic Agents ; Sialic Acid Binding Ig-like Lectin 2 ; CD22 protein, human |
Language | English |
Publishing date | 2024-02-07 |
Publishing country | United States |
Document type | Journal Article |
ZDB-ID | 2063563-1 |
ISSN | 1538-8514 ; 1535-7163 |
ISSN (online) | 1538-8514 |
ISSN | 1535-7163 |
DOI | 10.1158/1535-7163.MCT-23-0506 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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