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Updated: Apr 11, 2026

Quadruple-Checkerboard: A Modification of the Three-Dimensional Checkerboard for Studying Drug Combinations
Published on: July 24, 2021
Methods: for studying pharmacogenetic profiles of combination chemotherapeutic drugs
Antonello Di Paolo1, Marialuisa Polillo, Marianna Lastella
1University of Pisa, Department of Clinical and Experimental Medicine, Via Roma 55, 56126 Pisa , Italy +39 050 2218755 ; +39 050 2218758 ; antonello.dipaolo@med.unipi.it.
Introduction:
Molecular and genetic analysis of tumors and individuals has led to patient-centered therapies, through the discovery and identification of genetic markers predictive of drug efficacy and tolerability. Present therapies often include a combination of synergic drugs, each of them directed against different targets. Therefore, the pharmacogenetic profiling of tumor masses and patients is becoming a challenge, and several questions may arise when planning a translational study.
Areas Covered:
The review presents the different techniques used to stratify oncology patients and to tailor antineoplastic treatments according to individual pharmacogenetic profiling. The advantages of these methodologies are discussed as well as current limits.
Expert Opinion:
Facing the rapid technological evolution for genetic analyses, the most pressing issues are the choice of appropriate strategies (i.e., from gene candidate up to next-generation sequencing) and the possibility to replicate study results for their final validation. It is likely that the latter will be the major obstacle in the future. However, the present landscape is opening up new possibilities, overcoming those hurdles that have limited result translation into clinical settings for years.
Insights
Pharmacogenetic profiling is crucial for personalized cancer therapies, guiding treatment selection based on genetic markers. Challenges include choosing analysis strategies and ensuring result reproducibility for clinical translation.
Area of Science:
- Oncology
- Pharmacogenomics
- Translational Research
Background:
- Molecular and genetic analyses identify markers for patient-centered cancer therapies, predicting drug efficacy and tolerability.
- Current treatments often combine synergistic drugs targeting different pathways, necessitating comprehensive pharmacogenetic profiling.
- Pharmacogenetic profiling of tumors and patients presents challenges for translational study design.
Purpose of the Study:
- To review techniques for stratifying oncology patients based on pharmacogenetic profiles.
- To discuss the advantages and limitations of methodologies for tailoring antineoplastic treatments.
- To address challenges in pharmacogenetic profiling for personalized cancer care.
Main Methods:
- Review of various techniques for pharmacogenetic profiling in oncology.
- Discussion of patient stratification strategies.
- Analysis of methods for tailoring antineoplastic treatments.
Main Results:
- Identification of diverse techniques for individual pharmacogenetic profiling.
- Evaluation of the benefits and drawbacks of current methodologies.
- Highlighting the complexity of choosing appropriate genetic analysis strategies.
Conclusions:
- Rapid advancements in genetic analysis necessitate careful selection of strategies, from gene candidate to next-generation sequencing.
- Replication of study results for validation poses a significant future obstacle.
- The evolving landscape offers new opportunities to overcome previous limitations in translating research to clinical practice.
Related Concept Videos
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Pharmacogenetics and Pharmacogenomics: Overview
Pharmacogenetic Phenotypes: Alterations in Pharmacokinetics, Drug Targets and Biologic Milieu
Pharmacogenomics: Identification of New Drug Targets
Pharmacogenetics of Drug Targets: β₂-Adrenergic Receptors, Apo E, Thymidylate Synthase
Principles of Pharmacogenetics: Types of Genetic Variants

