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[Methods for diagnosing MDR: immunohistochemistry versus molecular biology]
1Service d'oncologie médicale, centre hospitalier universitaire, Grenoble, France.
Bulletin Du Cancer
|December 1, 1994
Summary
Detecting multidrug resistance (MDR) in tumors involves various methods, but no single technique fully assesses functional activity or accounts for all resistance mechanisms. Current diagnostic approaches lack consensus for guiding chemotherapy choices.
Area of Science:
- Oncology
- Molecular Biology
- Biochemistry
Background:
- Multidrug resistance (MDR) is a significant challenge in human malignant tumors, necessitating accurate detection methods.
- Numerous techniques exist for MDR detection, including molecular biology processes and in situ hybridization or immunohistochemistry.
Purpose of the Study:
- To review and compare the various methods for detecting multidrug resistance in human malignant tumors.
- To highlight the limitations of current methods in assessing functional activity and guiding treatment decisions.
Main Methods:
- Molecular biology techniques (Slot Blot, Northern Blot, RT-PCR) offer sensitivity but lack specificity.
- In situ hybridization and immunohistochemistry provide specificity but do not assess functional activity.
- Functional GP170 activity detection involves rhodamine/daunorubicin accumulation via flux cytometry or Tc-Sestamibi imaging.
Main Results:
- No single method provides a comprehensive assessment of multidrug resistance, combining sensitivity, specificity, and functional activity.
- The multiplicity of detection methods indicates a lack of consensus on the optimal approach.
- Existing methods do not account for other potential chemoresistance mechanisms.
Conclusions:
- Multidrug resistance biological diagnosis alone should not dictate the choice of second-line chemotherapy or MDR revertant agents.
- A comprehensive understanding of tumor resistance, including functional activity and alternative mechanisms, is crucial for effective cancer treatment planning.