Genetic predisposition syndromes and their management
David M Euhus1, Linda Robinson
1Department of Surgery, UT Southwestern Medical Center at Dallas, Dallas, TX, USA. David.euhus@utsouthwestern.edu
The Surgical Clinics of North America
|March 8, 2013
Summary
Genetic testing for breast cancer susceptibility genes aids in risk assessment and management. Early genetic counseling and testing inform crucial treatment decisions for newly diagnosed patients.
Area of Science:
- Oncology
- Genetics
- Medical Diagnostics
Background:
- Over a dozen breast cancer susceptibility genes, including BRCA1, BRCA2, and TP53, have been identified.
- Identifying individuals with genetic predispositions relies on family cancer history and physical examination markers.
- Genetic testing offers a precise method for stratifying individual cancer risk.
Purpose of the Study:
- To highlight the importance of genetic testing in breast cancer management.
- To inform clinicians about the role of genetic information in treatment planning.
- To outline risk management options for mutation carriers.
Main Methods:
- Evaluation of cancer family history.
- Physical examination for phenotypic markers.
- Genetic testing for susceptibility gene mutations.
- Genetic counseling.
Main Results:
- Genetic testing enables individualized risk stratification.
- Mutation carriers have multiple risk management options.
- Genetic information influences surgical, radiation, and systemic therapy decisions.
Conclusions:
- Genetic counseling and testing are integral to the initial evaluation of newly diagnosed breast cancer patients.
- This information is critical for optimizing surgical, radiation, and systemic therapy choices.
- Proactive management strategies can be implemented for mutation carriers.
Related Concept Videos
Human Genetics
Human genetics provides a profound framework for understanding the interplay between genetic predispositions and human psychology. At the heart of this discipline lies the study of how genes influence physical traits, behaviors, and susceptibility to diseases. Each person carries a unique genetic code that subtly or significantly shapes their psychological and behavioral landscape.
The complex relationship between genetics and psychology is observable through common biological components such...
The complex relationship between genetics and psychology is observable through common biological components such...
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...
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...
Sex-linked Disorders
Like autosomes, sex chromosomes contain a variety of genes necessary for normal body function. When a mutation in one of these genes results in biological deficits, the disorder is considered sex-linked.
Genomic Imprinting and Inheritance
Diploid organisms inherit genetic material through chromosomes from both parents. Copies of the same gene are known as alleles. In most cases, both alleles are simultaneously expressed and allow various cellular processes to function optimally. If one of the alleles is missing or mutated, the expression of the other allele can compensate; however, this is not true for all genes.
The expression of some genes depends on which parent passed the gene to the offspring, through a phenomenon known as...
The expression of some genes depends on which parent passed the gene to the offspring, through a phenomenon known as...
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...

