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Ask the experts: what is biomarker testing?

Ask the experts: what is biomarker testing?

Biomarker testing helps us find out what makes a particular breast cancer "tick" - and helps us find the right treatment.

Written by Jameson Kowalczyk.

Medically reviewed by Megan Burke, MD.

Updated onNovember, 2026

Written by Jameson Kowalczyk.

Medically reviewed by Megan Burke, MD.

Updated onNovember, 2026

Featured content

4 resources for metastatic breast cancer caregivers

4 resources for metastatic breast cancer caregivers

Follow these links to find support and information about caring for someone living with advanced or metastatic breast cancer.

Helping your loved one with metastatic breast cancer eat well

Helping your loved one with metastatic breast cancer eat well

A registered dietitian discusses how nutritious foods can help your loved one living with MBC.

Understanding PIK3CA, AKT1, and PTEN in breast cancer treatment

Understanding PIK3CA, AKT1, and PTEN in breast cancer treatment

Three biomarkers that can play a critical role in choosing second-line therapies for HR+/HER2- breast cancers.

Second-line therapies for advanced HR+/HER2- breast cancer

Second-line therapies for advanced HR+/HER2- breast cancer

Treatment options for advanced HR-positive/HER2-negative breast cancer that does not respond to initial therapy.

What if breast cancer stops responding to hormone therapy?

What if breast cancer stops responding to hormone therapy?

An overview of treating HR+/HER2- breast cancer, with a look at what therapies are used when an initial therapy isn’t effective.

Ask the experts: how can I maintain my quality of life while living with metastatic breast cancer?

Ask the experts: how can I maintain my quality of life while living with metastatic breast cancer?

There are many ways you can improve your quality of life while living with metastatic breast cancer. Maryam Lustberg, MD, explains how.

Ask the experts: what are my treatment options for metastatic breast cancer?

Ask the experts: what are my treatment options for metastatic breast cancer?

There are many treatment options for metastatic breast cancer, depending on its type.