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Updated: Aug 2, 2025
Implantation and Evaluation of Melanoma in the Murine Choroid via Optical Coherence Tomography
Published on: December 2, 2022
Multiorgan Involvement of Dormant Uveal Melanoma Micrometastases in Postmortem Tissue From Patients Without
Viktor T Gill1,2, Emelie Norrman2, Shiva Sabazade1,3
1Department of Clinical Neuroscience, Division of Eye and Vision, Karolinska Institutet, Stockholm, Sweden.
Objectives:
Almost half of all patients diagnosed with uveal melanoma will die of metastatic disease. This has been attributed to early seeding of micrometastases. We investigate the presence, density, organ involvement, and characteristics of micrometastases of uveal melanoma in tissue obtained at autopsy of patients with and without coexisting macrometastases.
Methods:
Patients diagnosed with primary uveal melanoma at a national referral center between 1960 and 2020 (n = 4,282) were cross-referenced with autopsy registers at nearby hospitals. Eleven patients were included. Formalin-fixed, paraffin-embedded tissue samples obtained during autopsy were examined with routine histology, immunohistochemistry, and immunomagnetic separation.
Results:
Micrometastases were detected in 5 of 5 patients with and in 5 of 6 patients without coexisting macrometastases. Micrometastases were identified in several sites, including lungs, kidneys, myocardium, and bone marrow. Their highest density per mm2 of tissue was seen in the liver. Of 11 examined patients, 2 had at least 1 BAP-1-positive metastasis. All micrometastases had immune cell infiltrates and no or very low proliferative activity.
Conclusions:
We demonstrate multiorgan involvement of apparently dormant micrometastases in patients with uveal melanoma. This suggests that micrometastases are present in nearly all patients diagnosed with primary uveal melanoma, regardless of coexisting macrometastases.
