HERmark® FAQs

HERmark® FAQs

HERmark is an assay that precisely measures HER-2 total protein expression in patients with breast cancer. Clinical studies demonstrate that HERmark is an accurate method for stratifying patients with breast cancer who are more likely to respond to trastuzumab-containing therapy.

Call Monogram Oncology Services (800-777-0177) to set up an account. Monogram Biosciences will provide a test request form, shipping kit, and instructions on how to send the tissue to the Monogram’s central laboratory in South San Francisco, California.

The HERmark breast cancer assay is based on VeraTag® technology. HERmark quantitatively measures HER-2 total protein using a dual antibody format, whereby a fluorescent tag on one analyte-specific antibody is cleaved when in close proximity to a second antibody containing a photoactivated molecule. The fluorescent tags are then quantified using capillary electrophoresis (CE). 

The HERmark report is based on reference data from 1090 samples in both adjuvant and metastatic breast cancer patient cohorts. The patient data represent a large sample size and covers a broad range of HER-2 protein levels. Therefore, the HERmark Breast Cancer Assay can accurately quantify HER-2 total protein expression in most properly formalin-fixed paraffin-embedded (FFPE) breast cancer tumor tissue specimens.

HERmark is covered and reimbursed by Medicare. Many other payers are currently reimbursed for the HERmark Breast Cancer Assay. Monogram works directly with providers and payers to gain reimbursement as quickly as possible. In addition, the company will work with each patient regarding coverage and reimbursement if needed. For assistance with billing questions, contact our Gateway assistance line at 877-436-6243.

Monogram has published clinical data utilizing HERmark and other VeraTag® assays in multiple peer-reviewed journals. Click here to view our publications.

HERmark measures HER-2 total proteins using the VeraTag®​ technology platform. VeraTag assays for measurement of multiple other protein biomarkers are available for use in preclinical development and clinical trials. Click here to learn more about VeraTag applications. 

Test results are reported via vLink, Monogram's online reporting system, FedEx®, fax, or mail. With vLink, you will be notified by e-mail when the report is ready, and a downloadable PDF file of the report will be provided through a secure Web link.

Physicians may call our toll-free Client Services number (800-777-0177) to schedule a discussion with our Medical Affairs Group. Based on your specific need, you will be contacted within 24 hours.


Invasive breast carcinoma, FFPE (formalin-fixed paraffin-embedded) tissue specimens (excisional biopsy specimens preferred). Large core biopsies are also acceptable.


Four slides: 5-μM sections on glass slides (A total of four unstained slides per patient are required; freshly cut sections should be sent within one week.) or one paraffin-embedded tissue block. If multiple blocks are available, select the tissue block with the highest amount of viable invasive tumor; submit only one block.

The HERmark Breast Cancer Assay has been prospectively analyzed in archived tumor specimens that are invasive carcinoma. There are no data on ductal carcinoma in situ (DCIS) or lobular carcinoma in situ (LCIS).

Yes, expect to receive the block in about seven business days.