Drug resistance: challenges to effective therapy

Area of Science:

• Oncology
• Cancer Biology
• Pharmacology

Background:

• Therapy resistance, characterized by tumor recurrence and metastasis, significantly limits current cancer treatment efficacy.
• Overcoming drug resistance necessitates interventions targeting both cancer cells and the tumor microenvironment.
• Multidrug resistance (MDR) and challenges in molecular targeted therapy are critical issues in cancer treatment.

Purpose of the Study:

• To review mechanisms of drug resistance intrinsic to cancer cells and those mediated by the tumor microenvironment.
• To discuss the role of the DNA damage tolerance pathway in conferring resistance to diverse drugs.
• To highlight the importance of clinically relevant, three-dimensional in vivo model systems for evaluating drug sensitivity and identifying novel therapeutic targets.

Main Methods:

• Review of existing literature on cancer drug resistance mechanisms.
• Analysis of the DNA damage tolerance pathway's contribution to multidrug resistance.
• Discussion on the necessity of advanced model systems for drug sensitivity evaluation.

Main Results:

• The DNA damage tolerance pathway confers resistance to a wide range of structurally and functionally unrelated drugs.
• Tumor microenvironment plays a crucial role in mediating cancer drug resistance.
• Clinically relevant model systems are essential for understanding tumor-microenvironment interactions and identifying resistance mechanisms.

Conclusions:

• Targeting the DNA damage tolerance pathway presents a promising strategy for overcoming drug resistance in cancer therapy.
• Integrative approaches considering both tumor cells and their microenvironment are vital for developing effective cancer treatments.
• Novel therapeutic targets can be identified by disrupting tumor-cell and microenvironment interactions.