Repeat Biomarker Status in Breast Resection Specimens With Controlled Cold Ischemic Time.

Objectives: Current College of American Pathologists/American Society of Clinical Oncology guidelines recommend cold ischemic time (CIT) of 1 hour or less for breast specimens to preserve biomarker expression, although some publications support an acceptable CIT of 4 hours or less. We retrospectively evaluated changes in estrogen receptor (ER), progesterone receptor (PR), and human epidermal growth factor receptor 2 (HER2) from biopsy to resection specimens that were triaged to optimize CIT.

Methods: We identified breast resection specimens collected after institutional implementation of a triage protocol. Clinicopathologic features were assessed.

Results: In total, 295 excisions had a prior malignant diagnosis, with CIT of 4 hours or less and repeat ER, PR, and/or HER2; 230 (78%) had CIT of 1 hour or less, and 65 (22%) had CIT of more than 1 hour but 4 hours or less. Categorical change was seen in 10 (17.9%) of 56 with repeated ER/PR and 38 (13.3%) of 285 with repeated HER2 (of which five [1.8%] had meaningful change).

Conclusions: When CIT is optimized, a meaningful change in biomarker expression is infrequent. This study supports that when specimens are appropriately triaged, CIT of 4 hours or less may be acceptable.