Is a breast cancer gene expression test done with next-generation sequencing?

A gene expression test examines how actively selected genes are switched on in a breast tumour sample. The result can help a cancer team discuss how tumour biology may influence treatment decisions in an appropriate clinical setting. It is different from an inherited genetic test, which looks for DNA changes that may run in a family.

Next-generation sequencing reads DNA or RNA sequences across selected regions. Some expression assays use sequencing-based technology, while others use a different platform designed to measure gene activity. The test name and laboratory report should identify the method rather than assumptions based on the phrase gene expression.

Ask the oncology team which assay was ordered, what tissue is required, whether the sample has enough material, and how the result will be combined with tumour features and other pathology. A gene expression score should be interpreted in context; it is not a stand-alone diagnosis or a substitute for the pathology report.

Contact the treating team if a biopsy site becomes increasingly red, swollen, painful or draining, or if fever develops after a procedure. Do not wait for a gene expression result to report a new breast change or worsening symptoms. Seek urgent care for severe bleeding, fainting, chest pain or difficulty breathing.

Ask whether the assay measures gene expression or inherited DNA, which platform the laboratory uses, what the score can and cannot show, and how it fits with tumour stage, grade and receptor findings.