{"denomUnitsSelected":"Participants","description":"Responses will be assessed at baseline, after initiating therapy, and correlated with clinical responses over time. Among patients with corresponding MHC-peptide tetramers, pre- and post-treatment samples of circulating MCPyV-specific CD8 T cells will be isolated and subjected to deep immunophenotyping by messenger ribonucleic acid (mRNA) expression analysis.","reportingStatus":"NOT_POSTED","timeFrame":"After 2 years of treatment","title":"Merkel Polyomavirus (MCPyV)-Specific Immune Response, Assessed With Enzyme-linked Immunosorbent Spot and Serology Assays","type":"OTHER_PRE_SPECIFIED"}