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Immunohistochemistry for PRAME in the Distinction of Nodal Nevi From Metastatic Melanoma.

Abstract

The distinction of metastatic melanoma from melanocytic nevi in lymph nodes can on occasion be difficult. As diffuse immunohistochemical (IHC) PRAME (PReferentially expressed Antigen in MElanoma) expression is detected in the majority of primary and metastatic melanomas, but rarely in nevi, we reasoned that PRAME could be a useful adjunct marker for the diagnosis of melanocytes in lymph nodes. In this study, we examined 45 nodal melanocytic deposits comprising 30 nodal nevi and 15 melanoma metastases. The latter were diagnostically not straightforward because they either coexisted with nodal nevi or were present in perinodal fibrous tissue. All nodal nevi (30/30) were negative for PRAME, whereas all melanoma metastases (15/15) were diffusely positive for PRAME IHC. We additionally report the novel use of a PRAME/Melan A dual-label immunostain. Our results show that PRAME IHC may be useful in the assessment of diagnostically challenging nodal melanocytic deposits, such as intraparenchymal nodal nevi, metastases confined to the capsular fibrous tissue, or in the setting of small metastases coexisting with a nodal nevus in the same lymph node.

Authors+Show Affiliations

Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, NY.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

31633488

Citation

Lezcano, Cecilia, et al. "Immunohistochemistry for PRAME in the Distinction of Nodal Nevi From Metastatic Melanoma." The American Journal of Surgical Pathology, 2019.
Lezcano C, Pulitzer M, Moy AP, et al. Immunohistochemistry for PRAME in the Distinction of Nodal Nevi From Metastatic Melanoma. Am J Surg Pathol. 2019.
Lezcano, C., Pulitzer, M., Moy, A. P., Hollmann, T. J., Jungbluth, A. A., & Busam, K. J. (2019). Immunohistochemistry for PRAME in the Distinction of Nodal Nevi From Metastatic Melanoma. The American Journal of Surgical Pathology, doi:10.1097/PAS.0000000000001393.
Lezcano C, et al. Immunohistochemistry for PRAME in the Distinction of Nodal Nevi From Metastatic Melanoma. Am J Surg Pathol. 2019 Oct 16; PubMed PMID: 31633488.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Immunohistochemistry for PRAME in the Distinction of Nodal Nevi From Metastatic Melanoma. AU - Lezcano,Cecilia, AU - Pulitzer,Melissa, AU - Moy,Andrea P, AU - Hollmann,Travis J, AU - Jungbluth,Achim A, AU - Busam,Klaus J, Y1 - 2019/10/16/ PY - 2019/10/22/entrez JF - The American journal of surgical pathology JO - Am. J. Surg. Pathol. N2 - The distinction of metastatic melanoma from melanocytic nevi in lymph nodes can on occasion be difficult. As diffuse immunohistochemical (IHC) PRAME (PReferentially expressed Antigen in MElanoma) expression is detected in the majority of primary and metastatic melanomas, but rarely in nevi, we reasoned that PRAME could be a useful adjunct marker for the diagnosis of melanocytes in lymph nodes. In this study, we examined 45 nodal melanocytic deposits comprising 30 nodal nevi and 15 melanoma metastases. The latter were diagnostically not straightforward because they either coexisted with nodal nevi or were present in perinodal fibrous tissue. All nodal nevi (30/30) were negative for PRAME, whereas all melanoma metastases (15/15) were diffusely positive for PRAME IHC. We additionally report the novel use of a PRAME/Melan A dual-label immunostain. Our results show that PRAME IHC may be useful in the assessment of diagnostically challenging nodal melanocytic deposits, such as intraparenchymal nodal nevi, metastases confined to the capsular fibrous tissue, or in the setting of small metastases coexisting with a nodal nevus in the same lymph node. SN - 1532-0979 UR - https://www.unboundmedicine.com/medline/citation/31633488/Immunohistochemistry_for_PRAME_in_the_Distinction_of_Nodal_Nevi_From_Metastatic_Melanoma L2 - http://dx.doi.org/10.1097/PAS.0000000000001393 DB - PRIME DP - Unbound Medicine ER -