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Updated: May 18, 2026

Malachite Green Assay for the Discovery of Heat-Shock Protein 90 Inhibitors
Published on: January 20, 2023
HSP90 inhibitors for cancer therapy and overcoming drug resistance
1Breast Cancer Medicine Service, Department of Medicine, Memorial Sloan-Kettering Cancer Center, NY, USA.
Abstract:
Since the initial discovery of heat shock protein 90 (HSP90) as a target for anticancer therapy, tremendous progress has been made in developing a multitude of potent first- and second-generation HSP90 inhibitors. Promising activity has been reported with 17-AAG in combination with trastuzumab in HER2 positive breast cancer refractory to trastuzumab therapy and more recently in ALK-mutated lung cancers. However, the full potential of this class of agents is yet to be realized. This review not only provides an up-to-date overview of the clinical development of HSP90 inhibitors and their companion biomarker assays but also provides insight into the less-understood role of HSP90 in tumor evolution and drug resistance. A better understanding of these important concepts will facilitate the optimal and expedient development of this class of agents, ultimately fulfilling their promise as potent anticancer therapeutics and leading to the regulatory approval of the first-in-class HSP90 inhibitor.
Insights
Heat shock protein 90 (HSP90) inhibitors show promise in cancer therapy, with ongoing research into their role in tumor evolution and drug resistance. Understanding HSP90 is key to developing new anticancer drugs.
Area of Science:
- Oncology
- Molecular Biology
- Pharmacology
Background:
- Heat shock protein 90 (HSP90) is a validated target for anticancer therapy.
- Numerous first- and second-generation HSP90 inhibitors have been developed.
- Early clinical studies show promise for HSP90 inhibitors in specific cancers.
Purpose of the Study:
- To provide an updated overview of HSP90 inhibitor clinical development and biomarker assays.
- To explore the role of HSP90 in tumor evolution and drug resistance.
- To guide the optimal development of HSP90 inhibitors for regulatory approval.
Main Methods:
- Literature review of clinical trials and preclinical studies on HSP90 inhibitors.
- Analysis of biomarker data associated with HSP90 inhibitor therapies.
- Synthesis of current understanding of HSP90's function in cancer progression.
Main Results:
- Significant progress in developing potent HSP90 inhibitors.
- Reported activity of 17-AAG in combination therapies for HER2+ breast and ALK-mutated lung cancers.
- Identified gaps in understanding HSP90's role in resistance and evolution.
Conclusions:
- HSP90 inhibitors represent a promising class of anticancer therapeutics.
- Further research into HSP90's function is crucial for maximizing therapeutic potential.
- Optimized development strategies are needed to achieve regulatory approval for HSP90 inhibitors.
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