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Updated: May 13, 2026

Implementation of In Vitro Drug Resistance Assays: Maximizing the Potential for Uncovering Clinically Relevant Resistance Mechanisms
08:46

Implementation of In Vitro Drug Resistance Assays: Maximizing the Potential for Uncovering Clinically Relevant Resistance Mechanisms

Published on: December 9, 2015

Mechanisms and insights into drug resistance in cancer

Hiba Zahreddine1, Katherine L B Borden

  • 1Department of Pathology and Cell Biology, Institute of Research in Immunology and Cancer, Université de Montréal Montreal, QC, Canada.

Frontiers in Pharmacology
|March 19, 2013
PubMed

Insights

Cancer cells develop resistance to drugs through various mechanisms, including altered drug processing and genetic changes, leading to treatment failure and multidrug resistance. Understanding these pathways is crucial for developing next-generation cancer therapies.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Research

Background:

  • Cancer drug resistance is a significant obstacle in cancer treatment.
  • Resistance can be intrinsic (pre-existing) or acquired (developing during therapy).
  • Multidrug resistance (MDR) presents a particularly challenging clinical problem.

Purpose of the Study:

  • To review the diverse mechanisms by which cancer cells achieve drug resistance.
  • To highlight the role of tumor heterogeneity in the emergence of resistant populations.
  • To discuss how understanding resistance mechanisms can inform future cancer therapeutic strategies.

Main Methods:

  • This review synthesizes current knowledge on cancer drug resistance mechanisms.
  • It examines alterations in drug transport, metabolism, and target modification.
  • The role of genetic rewiring, apoptosis evasion, and tumor heterogeneity is discussed.

Main Results:

  • Cancer cells employ multiple strategies to resist chemotherapy, including altered drug pharmacokinetics and pharmacodynamics.
  • Genetic mutations, gene amplification, and epigenetic modifications contribute to resistance.
  • Tumor heterogeneity allows pre-existing resistant subpopulations to thrive under drug pressure.
  • Some resistance mechanisms confer cross-resistance to multiple drugs (multidrug resistance).

Conclusions:

  • Elucidating the complex mechanisms of cancer drug resistance is essential for improving patient outcomes.
  • Targeting resistance pathways and leveraging tumor heterogeneity insights are key for next-generation cancer therapies.
  • A deeper understanding of resistance biology will guide the development of more effective and durable cancer treatments.
Keywords:
collateral sensitivitydrug metabolismdrug transportersmicroenvironmentmultidrug resistanceoncogene addictionorigin of cancersynthetic lethality

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