SLOs:

• Differentiate between dominant and recessive inheritance

• Explain variable penetrance in BRCA mutations

• Recognize clinical features of hereditary breast cancer syndromes including PALB2, ATM, and CHEK2

• Select appropriate patients for genetic testing based on updated NCCN criteria

• Describe different genetic testing methodologies including VUS interpretation

• Develop management plans based on genetic findings

General Instructions:

In this activity, you will demonstrate your understanding of genetic principles in breast cancer risk assessment and management through the development of educational materials and peer evaluation.

Step 1: Research and Preparation

•  First, review the slide sets on "Principles of Cancer Genetics" and "Genetic Testing and Counseling." These will provide you with foundational knowledge about inheritance patterns, gene penetrance, and genetic testing methodologies.

•  Then read the articles "Hereditary Breast Cancer: Beyond BRCA" and "Clinical Management of Patients with Variants of Uncertain Significance."

•  Review the current NCCN guidelines for genetic/familial high-risk assessment for breast, ovarian, and pancreatic cancer.

•  You may also wish to review additional resources on cancer genetics and genetic testing for a more comprehensive understanding.

Step 2: Develop Educational Materials

Develop 2 educational materials (800-1000 words) for healthcare professionals that address the following:

Your responses must demonstrate clinical reasoning and application of genetic principles, not just summary of content.

1. Create a guide to hereditary breast cancer syndromes that includes the following:
   

• Define and differentiate between Autosomal dominant inheritance and Autosomal recessive inheritance. Explain why BRCA-related breast cancer follows dominant inheritance

• Include a sample three-generation pedigree demonstrating autosomal dominant inheritance in a breast cancer family with annotations showing:

1. Multiple affected individuals across generations

2. ~50% transmission pattern

3. Unaffected carriers (demonstrating incomplete penetrance)

• Explain how inheritance pattern informs genetic counseling (50% risk for first-degree relatives) and cascade testing strategy

• Include a comparison table of at least five hereditary breast cancer syndromes (including BRCA1/2, PALB2, ATM, and CHEK2), their inheritance patterns, estimated cancer risks, associated clinical features, and key evidence-based surveillance recommendations

• Explain variable penetrance and expressivity with specific examples related to breast cancer genes

• A discussion of gene-environment interactions in hereditary breast cancer

• Introduce risk-reducing intervention options with their efficacy and limitations and cascade testing recommendations for family members.

2. Develop a clinical decision algorithm for genetic testing referral and interpretation that includes:
   

• Outline the current NCCN criteria for genetic testing referral with specific attention to updates in the most recent guidelines

• Describe the following genetic testing technologies:

1. Next-generation sequencing (NGS): What it detects (point mutations, small indels), advantages (multi-gene panels, cost-effective), limitations (may miss large deletions/duplications)

2. Deletion/duplication analysis (MLPA or aCGH): What it detects (large rearrangements), why needed (~5-10% of BRCA mutations are large deletions missed by sequencing alone)

3. Sanger sequencing: When used (confirmation, known familial variants)

• Explain the following test selection approaches

1. Single-gene testing: When appropriate (known familial variant, specific syndrome suspicion)

2. Multi-gene panel testing: Advantages (comprehensive, identifies unexpected mutations), disadvantages (higher VUS rate)

3. Panel composition: Which genes to include based on clinical presentation

• A structured framework for interpreting and managing variants of uncertain significance (VUS)

Your educational materials should be evidence-based, clinically relevant, and organized in a manner that facilitates learning and application in clinical practice. Include visual elements (tables, algorithms, or decision trees) to enhance understanding.

Step 3: Share

To share your work, click on the "Add a new discussion topic" button under this post and paste your work into the "Message" box. Make sure to reference others' intellectual property when necessary. All references should follow 7th Edition APA formatting. For further instructions, see the resource on the Himmelfarb Health Sciences Library: APA citation resource (N.B.: references are excluded from word counts).