Genotype-Phenotype Correlations in Breast Cancer

Area of Science:

• Oncology
• Genetics
• Pathology

Background:

• Few breast cancer histologic subtypes exhibit distinct genetic alterations correlating with specific morphology (genotype-phenotype correlation).
• Secretory carcinomas and adenoid cystic carcinomas show recurrent translocations.
• Invasive lobular carcinomas often present with CDH1 mutations.

Purpose of the Study:

• To review clinical and pathologic features of breast cancer subtypes with established genotype-phenotype correlations.
• To examine the underlying genetic alterations in these specific breast cancer subtypes.
• To discuss phenotypes associated with germline mutations in hereditary breast cancer genes.

Main Methods:

• Literature review of clinical and pathologic features.
• Analysis of genetic alterations in specific breast cancer subtypes.
• Review of hereditary breast cancer genetics.

Main Results:

• Secretory carcinomas and adenoid cystic carcinomas are linked to specific translocations.
• Invasive lobular carcinomas frequently harbor CDH1 mutations.
• Solid papillary carcinoma with reverse polarity shows IDH2 mutations.

Conclusions:

• Specific genetic alterations define certain breast cancer histologic subtypes.
• Understanding genotype-phenotype correlations aids in diagnosis and potentially treatment.
• Germline mutations in hereditary breast cancer genes are associated with distinct clinical phenotypes.