Synthesis and Evaluation of Camptothecin Antibody-Drug Conjugates

  • ACS Med Chem Lett. 2019 Sep 6;10(10):1386-1392. doi: 10.1021/acsmedchemlett.9b00301.
Wei Li  1 Karen H Veale  1 Qifeng Qiu  1 Kerstin W Sinkevicius  1 Erin K Maloney  1 Juliet A Costoplus  1 Janet Lau  1 Helen L Evans  1 Yulius Setiady  1 Olga Ab  1 Stephen M Abbott  1 Jenny Lee  1 Somsinee Wisitpitthaya  1 Anna Skaletskaya  1 Lintao Wang  1 Thomas A Keating  1 Ravi V J Chari  1 Wayne C Widdison  1
Affiliations
  • 1. ImmunoGen, Inc., 830 Winter Street, Waltham, Massachusetts 02451, United States.
Abstract

Antibody-drug conjugates (ADCs) that incorporate the exatecan derivative DXd in their payload are showing promising clinical results in solid tumor indications. The payload has an F-ring that also contains a second chiral center, both of which complicate its synthesis and derivatization. Here we report on new camptothecin-ADCs that do not have an F-ring in their payloads yet behave similarly to DXd-bearing conjugates in vitro and in vivo. This simplification allows easier derivatization of camptothecin A and B rings for structure-activity relationship studies and payload optimization. ADCs having different degrees of bystander killing and the ability to release hydroxyl or thiol-bearing metabolites following peptide linker cleavage were investigated.

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