Laboratory Services

HER2 –Colorectal Cancer

Print this page

Updated Test Information:

Test Description
HER2 –Colorectal Cancer

HER2 neu

General Information

Probes: HER2(17q12)/CEP 17 (17p11.2)

Disease(s): Colorectal Cancer

Specimen Requirements

Formalin fixed paraffin embedded (FFPE) tissue blocks or
2 unstained slides (4-5 microns thick sections)
1 H&E slide for pathology review (required)
1 IHC slide for pathology review (required)

Additional Processing Details

ASCO/CAP 2018 Guidelines recommend fixation time between 6 and 72 hours for breast tissue; however, special ASCO/CAP guidelines have not been established for colorectal cancer samples.

Transport to the testing lab at room temp is acceptable. Do not allow sample to overheat. Use cold pack for transport, making sure cold pack is not in direct contact with specimen

Required Information

Complete the Incyte Diagnostics hematology requisition with the patient's demographics and relevant clinical history. Label the specimen containers with patient's full name, second unique identifier, and specimen site/source.

Unacceptable Specimen Conditions

Specimen containers without two (2) patient identifiers, specimens submitted on non-positively charged slides, paraffin blocks that have been overheated or frozen, specimens without a H&E slide, slides or paraffin blocks with no tissue remaining, Samples fixed in fixative other than 10% neutral buffered formalin.

Department (code)



Fluorescence in-Situ Hybridization (FISH)

Estimated TAT

3-5 working days from receipt

Testing Schedule



Blocks:10 years
H&E and IHC Slides: 10 years
IF Slides: 30 days

CPT Code(s)

88377x1 manual

Additional Information

Clinical Significance: HER2, a member of the epidermal growth factor receptor family, is a transmembrane protein with tyrosine kinase activity. Gene amplification and protein overexpression of HER2 have been found in a variety of tumors. This test provides HER2 amplification status to aid in determining anti-HER2 targeted therapies for patients with colorectal cancer. Scoring is performed based on clinical guideline and clinical trial recommendations for colorectal cancer.

Limitations: Use of fixatives other than 10% formalin, fixation times less than six hours or greater than 48 hours may not yield reliable results.

Results of the HER-2/neu FISH assay should always be used in conjunction with other information available from the clinical evaluation of the patient and other prognostic factors, such as tumor size, histologic grade, nodal status, patient's age, hormone receptor status, and other known risk factors.