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The New Frontier of Antibody Drug Conjugates: Targets, Biology, Chemistry, Payloads

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Abstract

Over a hundred years ago, Dr. Paul Erlich, the famed Nobel Laureate, postulated a “magic bullet theory” for targeted delivery of pharmaceutical agents. Antibody-drug conjugates (ADCs) are one manifestation of that theory and consist of a highly specific tumor-antigen-targeting monoclonal antibody (mAb) that carries a chemically attached toxin for internalization and release within a tumor cell, facilitating its destruction in a precision manner. ADCs represent the interface of three separate scientific advancements: (1) technologies that generate mAbs with extraordinary selectivity and affinity for their targets; (2) improved knowledge of highly potent, cytotoxic natural products; and (3) advancements in synthetic medicinal and bioorganic chemistry. The recent regulatory approvals of two ADCs have provided clinical proof of principle that this therapeutic modality has a role to play in the antitumor armamentarium. This review has two distinct goals. The first is to introduce ADCs in clinical development that we believe represent the best of a new wave of investigational drug candidates in this field. The second is to review and expand upon the technology development that is driving the field forward, using better linker/payload chemistry and improved processes. Finally, we consider the hypothesis that ADCs will not only continue to advance in oncology care, but will in many settings also become standard-of-care therapeutics.

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Abbreviations

ADC:

Antibody-drug conjugate

ALL:

Acute lymphoblastic leukemia

ASH:

American Society of Hematology

BTD:

Breakthrough therapy designation

CLL:

Chronic lymphocytic leukemia

CR:

Complete response

CRi:

CR with incomplete hematologic recovery

DLBCL:

Diffuse large B cell lymphoma

DLT:

Dose-limiting toxicity

DM1:

Derivative of maytansine

DOR:

Duration of response

FL:

Follicular lymphoma

FR:

Folate receptor

FTD:

Fast track designation

IC:

Investigator’s choice

IHC:

Immunohistochemistry

mAb:

Monoclonal antibody

MCC:

[N-maleimidomethyl] cyclohexane-1-carboxylate

MMAE:

Monomethyl auristatin E

MMAF:

Monomethyl auristatin F

MTD:

Maximum tolerated dose

NHL:

Non-Hodgkin lymphoma

ORR:

Objective response rate

OS:

Overall survival

PFS:

Progression-free survival

TNBC:

Triple-negative breast cancer

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Thanos, C.D., Rennert, P.D. (2016). The New Frontier of Antibody Drug Conjugates: Targets, Biology, Chemistry, Payloads. In: Rennert, P. (eds) Novel Immunotherapeutic Approaches to the Treatment of Cancer. Springer, Cham. https://doi.org/10.1007/978-3-319-29827-6_8

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