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Updated: Aug 18, 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

Molecular mechanisms of drug resistance in tumours

D J Harrison1

  • 1Department of Pathology, University Medical School, Edinburgh, U.K.

The Journal of Pathology
|January 1, 1995
PubMed

Insights

Cancer cells often resist chemotherapy due to inherent traits or evolving drug resistance mechanisms. Understanding these molecular factors is key to improving cancer treatment efficacy.

Area of Science:

  • Oncology
  • Molecular Biology
  • Pharmacology

Background:

  • Chemotherapeutic drugs are crucial in cancer treatment.
  • Many human cancers exhibit resistance to these drugs at diagnosis or develop it during treatment.

Purpose of the Study:

  • To explore the molecular mechanisms underlying cancer drug resistance.
  • To understand why tumors are inherently resistant or develop resistance to chemotherapy.

Main Methods:

  • Review of existing literature on cancer drug resistance.
  • Analysis of molecular explanations for chemotherapy failure.

Main Results:

  • Drug resistance mechanisms include exclusion, impaired activation, increased detoxification, target alteration, enhanced DNA repair, and failed apoptosis.
  • These mechanisms can be inherent or acquired during tumor progression.
  • Multiple resistance factors often coexist within tumors.

Conclusions:

  • Cancer drug resistance is a complex multifactorial issue.
  • While laboratory studies show promise in modulating resistance, clinical application remains a future goal.

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