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Updated: Nov 3, 2025

A Bioluminescent and Fluorescent Orthotopic Syngeneic Murine Model of Androgen-dependent and Castration-resistant Prostate Cancer
Published on: March 6, 2018
Beyond the Androgen Receptor: The Sequence, the Mutants, and New Avengers in the Treatment of Castrate-Resistant
Daniel Westaby1, Paul V Viscuse2, Rahul Ravilla3
1The Institute of Cancer Research and The Royal Marsden Hospital, London, United Kingdom.
Abstract:
Targeting the androgen receptor by depriving testosterone with gonadotropin-releasing hormone agonists or antagonists, or surgical castration, has been the backbone of metastatic prostate cancer treatment. Although most prostate cancers initially respond to androgen deprivation, metastatic castration-resistant prostate cancer evolves into a heterogeneous disease with diverse drivers of progression and mechanisms of therapeutic resistance. Development of castrate resistance phenotype is associated with lethality despite the recent noteworthy strides gained via increase in therapeutic options. Identification of novel therapeutics to further improve survival and achieve durable responses in metastatic castration-resistant prostate cancer is a clinical necessity. In this review, we outline the existing avengers for treatment of metastatic castration-resistant prostate cancer by clinical presentation, placing into context the clinical state of the patient, such as burden of disease and symptoms. Doing so might aid in the ability to optimize the sequence of agents and allow for maximal exposure to life-prolonging therapeutics. Realizing the limitations of the androgen signaling inhibition, we explore the androgen-indifferent prostate cancer: the mutants. Classically, these subtypes have been associated with variant histology, but androgen-indifferent prostate cancer features are now frequently observed in association with heterogeneous morphologies, including double-negative prostate cancers, lacking both androgen receptor and neuroendocrine features, or clinicopathologic criteria, such as the aggressive variant prostate cancer criteria. The framework of new avengers against metastatic castration-resistant prostate cancer based on mechanism, including DNA repair, immune checkpoint inhibition, PTEN/PI3K/AKT pathway, prostate-specific membrane antigen targets, bispecific T-cell engagers, and radionuclide therapies, is summarized in this review.
Insights
Metastatic castration-resistant prostate cancer (mCRPC) requires new treatments as resistance develops. This review explores current and emerging therapies targeting diverse mCRPC mechanisms for improved survival.
Area of Science:
- Oncology
- Urology
- Cancer Therapeutics
Background:
- Androgen deprivation therapy is standard for metastatic prostate cancer, but resistance inevitably develops.
- Metastatic castration-resistant prostate cancer (mCRPC) is a heterogeneous disease with diverse progression drivers and therapeutic resistance mechanisms.
- Improved survival and durable responses in mCRPC necessitate novel therapeutic strategies.
Purpose of the Study:
- To review current and emerging treatment strategies for mCRPC.
- To categorize novel therapies based on their mechanisms of action.
- To guide optimal sequencing of treatments based on clinical presentation and patient status.
Main Methods:
- Literature review of existing and novel therapeutic approaches for mCRPC.
- Categorization of treatments by clinical presentation and patient burden of disease.
- Exploration of emerging therapeutic targets and mechanisms, including androgen-independent pathways.
Main Results:
- Current mCRPC treatments are reviewed, considering clinical context for optimizing therapy sequencing.
- Androgen-indifferent prostate cancer subtypes, including double-negative and aggressive variants, are discussed.
- Novel therapeutic strategies targeting DNA repair, immune checkpoints, signaling pathways, PSMA, T-cell engagers, and radionuclide therapy are summarized.
Conclusions:
- Optimizing treatment sequencing for mCRPC based on clinical presentation can maximize exposure to life-prolonging therapies.
- Understanding androgen-indifferent prostate cancer is crucial for developing effective treatments.
- A mechanistic framework for novel mCRPC therapies offers promise for improved patient outcomes.
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