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Pharmacogenetics and Pharmacogenomics: Overview

Pharmacogenetics and Pharmacogenomics: Overview

Pharmacogenetics and pharmacogenomics examine how genetic factors influence an individual's response to drugs. While pharmacogenetics focuses on the impact of specific genetic variants on drug effects, pharmacogenomics takes a broader approach, studying how genetic variation across populations contributes to differences in drug responses. These fields aim to explain why individuals may experience varying levels of efficacy or adverse reactions to the same medication.Variability in drug...

Principles of Pharmacogenetics: Types of Genetic Variants

Principles of Pharmacogenetics: Types of Genetic Variants

The human genome is over 99.9% identical between individuals, yet genetic differences exist at millions of bases. The human genome contains approximately 3 million variant positions per individual, many of which are heterozygous, contributing to genetic diversity and individual traits. Genetic variations include single-nucleotide polymorphisms (SNPs), insertions, deletions, and copy number variations (CNVs).SNPs, the most common variation, involve single-base changes in DNA. These can be...

Pharmacogenetic Phenotypes: Alterations in Pharmacokinetics, Drug Targets and Biologic Milieu

Pharmacogenetic Phenotypes: Alterations in Pharmacokinetics, Drug Targets and Biologic Milieu

Genetic variations significantly influence drug response through pharmacokinetics, receptor interactions, and biologic milieu modifications. Pharmacokinetic alterations impact drug metabolism and clearance, affecting efficacy and toxicity. Variants in drug-metabolizing enzymes, such as CYP2C9 and CYP2C19, alter drug activation and elimination. For example, CYP2C9 loss-of-function variants require lower warfarin doses to prevent excessive bleeding, while CYP2C19 variants reduce clopidogrel...

Pharmacogenetics of Drug Metabolism: Overview

Pharmacogenetics of Drug Metabolism: Overview

Genetic polymorphism in drug metabolism is crucial to the inter-individual variability observed in drug responses. Drug metabolism primarily involves the chemical modification of drugs and other xenobiotics to enhance their elimination by increasing their polarity. Two main classes of enzymes mediate this biotransformation process: Phase I enzymes, primarily cytochrome P450s, catalyze oxidation and reduction reactions, while other enzymes, such as esterases, mediate hydrolysis, and Phase II...

Pharmacogenetics of Drug Targets: β₂-Adrenergic Receptors, Apo E, Thymidylate Synthase

Pharmacogenetics of Drug Targets: β₂-Adrenergic Receptors, Apo E, Thymidylate Synthase

Genetic polymorphisms in drug targets have emerged as critical determinants of interindividual variability in drug response and toxicity. Pharmacogenomic investigations increasingly focus on identifying these variations to personalize and optimize therapeutic interventions. A drug target may be a receptor, enzyme, or signaling protein involved in pharmacologic responses or disease-related pathways. While early pharmacogenetic studies focused primarily on drug metabolism, current research...

Pharmacogenomics: Identification of New Drug Targets

Pharmacogenomics: Identification of New Drug Targets

Advances in genomics have profoundly influenced drug discovery by increasing both the speed and accuracy of pharmaceutical development. Pharmacogenomics, which examines how genetic variation influences drug response, facilitates the identification of novel therapeutic targets and enables patient stratification for personalized treatment. These strategies contribute to improved drug efficacy, minimized adverse effects, and more efficient clinical trial design.Mapping genetic differences...

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Updated: Jul 8, 2026

Evaluating the Effectiveness of Cancer Drug Sensitization In Vitro and In Vivo

Evaluating the Effectiveness of Cancer Drug Sensitization In Vitro and In Vivo

Published on: February 6, 2015

Pharmacogenetics and cancer therapy.

M V Relling¹, T Dervieux

¹Department of Pharmaceutical Sciences, St Jude Children's Research Hospital, Memphis, Tennessee 38105, USA. mary.relling@stjude.org

Nature Reviews. Cancer

|March 22, 2002

Summary

Pharmacogenetics studies how genetic variations influence drug responses, especially in cancer treatment. Understanding these genetic factors can lead to personalized drug dosages, improving efficacy and reducing toxicity.

Area of Science:

Pharmacology
Genetics
Oncology

Background:

Pharmacogenetics investigates genetic influences on drug efficacy and toxicity.
Cancer drug therapy often involves a narrow therapeutic window, balancing effectiveness against adverse effects.
Genetic variations in patients and tumors significantly impact treatment outcomes.

Purpose of the Study:

To explore the role of genetic variations in cancer drug response.
To highlight the potential for personalized medicine in oncology.
To reduce adverse drug events through genetic insights.

Main Methods:

Review of current pharmacogenetic research in cancer therapy.
Analysis of genetic factors influencing drug metabolism and targets.

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Correlation of genetic profiles with treatment efficacy and toxicity.

Main Results:

Genetic variations demonstrably alter patient responses to cancer drugs.
Tumor genetics also play a critical role in drug sensitivity and resistance.
Individualized dosing strategies based on genetic data show promise.

Conclusions:

Pharmacogenetics is crucial for optimizing cancer drug therapy.
Understanding patient and tumor genetics enables personalized treatment approaches.
This can lead to improved therapeutic outcomes and minimized side effects.