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Mechanisms of Therapy Resistance in Cancers—2nd Edition

A special issue of Cancers (ISSN 2072-6694). This special issue belongs to the section "Cancer Drug Development".

Deadline for manuscript submissions: 31 July 2026 | Viewed by 806

Special Issue Editor


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Guest Editor
Laboratory of Mechanistic Toxicology, Division of Translational Toxicology, National Institute of Environmental Health Sciences, Research Triangle Park, NC 27709, USA
Interests: oxidative stress; nitric oxide; topoisomerases; pharmacology of anticancer drugs; mechanism of drug resistance
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Special Issue Information

Dear Colleagues,

This Special Issue is the second edition of a previous Special Issue entitled “Mechanisms of Therapy Resistance in Cancers”.

Cancer is one of the leading causes of death in the US and across the world. The current management techniques for cancers include cytoreductive surgery, chemotherapy, targeted therapy, radiation therapy, endocrine therapy and immunotherapy. Despite the significant success achieved in treating cancers over the past few decades, the development of resistance to cytotoxic chemotherapeutic agents and/or novel targeted drugs continues to be a major problem in cancer therapies. Drug resistance, either before treatment (intrinsic) or following therapy (acquired), is responsible for most relapses of cancer and death. Cancer therapeutic resistance occurs as cancer cells develop resistance to therapy through various mechanisms, including (a) alterations and/or mutations of drug targets, e.g., topoisomerases; (b) overexpression of ABC-dependent transporter proteins, e.g., P-glycoprotein 170; (c) enhanced expression of detoxification proteins, e.g., SOD, and (d) enhanced expression of DNA damage repair proteins. Therapeutic failure cannot be an option, and we need to understand the dynamics of tumor adaptation in order to adequately adjust therapies. Therefore, a clear understanding of the mechanisms of drug resistance is essential to provide future guidance for successful treatment and to achieve better outcomes. In this Special Issue, new discoveries in the mechanisms of drug resistance will be discussed. In particular, we will highlight the roles of ATP-dependent transporters in multi-drug resistance, as well as the roles of enhanced detoxification in drug resistance. Furthermore, novel and emerging roles of resistance to immunotherapy will be emphasized. The complexity of the development of drug resistance indicates that combinational and personalized therapies might provide better strategies and improved efficacy for fighting drug resistance in clinics.

Dr. Birandra K. Sinha
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as communications are invited. For planned papers, a title and short abstract (about 250 words) can be sent to the Editorial Office for assessment.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Cancers is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2900 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • ATP-binding cassette transporters
  • cancer stem cells
  • extracellular ATP
  • repair of DNA damage
  • immunotherapy resistance

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Published Papers (1 paper)

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Research

21 pages, 8122 KB  
Article
Integrative Multi-Omics Analyses Reveal Mechanisms of Resistance to Hsp90β-Selective Inhibition
by Ian Mersich, Eahsanul Anik, Aktar Ali and Brian S. J. Blagg
Cancers 2025, 17(21), 3488; https://doi.org/10.3390/cancers17213488 - 30 Oct 2025
Viewed by 664
Abstract
Background/Objectives: Targeting Hsp90β with isoform-selective inhibitors offers a promising therapeutic strategy with reduced toxicity compared to pan-Hsp90 inhibition. However, mechanisms of resistance to Hsp90β-selective inhibition remain poorly defined. This study aimed to identify molecular determinants of Hsp90β dependency and pharmacologic resistance across cancer [...] Read more.
Background/Objectives: Targeting Hsp90β with isoform-selective inhibitors offers a promising therapeutic strategy with reduced toxicity compared to pan-Hsp90 inhibition. However, mechanisms of resistance to Hsp90β-selective inhibition remain poorly defined. This study aimed to identify molecular determinants of Hsp90β dependency and pharmacologic resistance across cancer types. Methods: We integrated gene dependency, transcriptomic, proteomic, metabolomic, and drug sensitivity data from the Cancer Cell Line Encyclopedia with in vitro validation using the Hsp90β-selective inhibitor, NDNB-25. Comparative and correlation analyses were performed to identify resistance-associated pathways, followed by network and combination drug testing to validate functional interactions. Results: Resistant cell lines exhibited extensive rewiring of Rho GTPase signaling, cytoskeletal remodeling, and metabolic adaptation, including mitochondrial dysfunction and redox imbalance. Integrated analyses linked these phenotypes to aryl hydrocarbon receptor (AHR) activation and compensatory Hsp90α expression. Experimental validation confirmed increased kynurenine levels, a known endogenous AHR ligand, in NDNB-25–acquired resistant cells. Gene–drug network integration revealed collateral sensitivity to carboplatin, which synergized with Hsp90β inhibition in resistant models. Conclusions: This study defines the molecular features and adaptive programs underlying resistance to Hsp90β-selective inhibition and identifies therapeutic vulnerabilities that can be exploited to overcome it. The findings establish a systems-level framework for predicting Hsp90β inhibitor response and support rational combination strategies, including carboplatin co-treatment, for future preclinical development. Full article
(This article belongs to the Special Issue Mechanisms of Therapy Resistance in Cancers—2nd Edition)
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