Abstract
Purpose
Rarely, melanoma is discovered in the parotid gland without an identifiable primary site. It is not known how patients with parotid melanoma of unknown primary (PMUP) compare to those with a known primary (PMKP). As such, we describe the largest series of patients with PMUP to date and compare them to patients with PMKP.
Methods
We analyzed cases from three sources: (1) the University Hospitals Case Medical Center pathology database (n = 45), (2) the Surveillance, Epidemiology, and End Results 18 database (n = 33), and (3) a comprehensive literature search (n = 32).
Results
PMUP patients were predominately male and presented at a mean age of 56 years. When compared to PMKP, PMUP cases were more likely to be diagnosed in the parotid parenchyma, present with stage IV disease, and develop distant metastases during follow-up in a shorter amount of time. However, there was no difference in overall survival between patients with PMUP and PMKP presenting with stage-matched disease.
Conclusions
Overall survival is similar for stage-matched patients with parotid melanoma presenting with an unknown and known primary site.
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Abbreviations
- LNs:
-
Lymph nodes
- CHNM:
-
Cutaneous head and neck melanoma
- MUP:
-
Melanoma of unknown primary
- PMUP:
-
Parotid melanoma of unknown primary
- PMKP:
-
Parotid melanoma of known primary
- UHCMC:
-
University Hospitals Case Medical Center
- SEER:
-
Surveillance, Epidemiology, and End Results
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Funding
This work was supported by grants from The Char and Chuck Fowler Family Foundation and The Dermatology Foundation.
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Jeffrey F. Scott, Cheryl L. Thompson, Ritva Vyas, Kord Honda, Chad Zender, Pierre Lavertu, Henry Koon, and Kevin D. Cooper declare that they have no conflict of interest. Rod Rezaee is a speaker for Biomet. Meg R. Gerstenblith receives funding from The Dermatology Foundation and The Char and Chuck Fowler Family Foundation.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. This article does not contain any studies with animals performed by any of the authors.
Informed consent
The Institutional Review Board at University Hospitals Case Medical Center approved this study and waived the requirement for informed consent given the nature of the data collection.
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Scott, J.F., Thompson, C.L., Vyas, R. et al. Parotid melanoma of unknown primary. J Cancer Res Clin Oncol 142, 1529–1537 (2016). https://doi.org/10.1007/s00432-016-2156-x
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DOI: https://doi.org/10.1007/s00432-016-2156-x