Impact of CMV Infection and Cancer Treatment on Vaccine Efficacy in Oncology Patients
Bhatt, D.; Joshi, M.; Visscher, F.; Boerma, A.; Oosting, S. F.; van der Veldt, A. A. M.; Hiltermann, T. J. N.; Geurts van Kessel, C. H.; Dingemans, A.-M. C.; Smit, E. F.; Haanen, J. B. A. G.; de Vries, E. G.; van Baarle, D.
Show abstract
Cytomegalovirus (CMV) infection leaves lasting effects on the immune system, particularly shaping T-cell populations. In patients with advanced cancer, persistent CMV exposure may influence vaccine responses due to immunosuppression from disease progression or prior therapies. To explore this, we developed CMVision, an open-source ELISpot scoring pipeline that goes beyond traditional spot-forming unit counts, enabling accurate analysis of complex T-cell responses, even in wells with overlapping or ambiguous spots. Using CMVision, we assessed SARS-CoV-2 spike-specific responses after mRNA vaccination in patients with cancer with receiving chemotherapy, immunotherapy or both combined and in cancer-free controls from the VOICE study. CMV-specific responses remained stable across groups. Notably, individuals with stronger CMV-reactivity showed enhanced spike-specific responses, suggesting CMV-memory may reflect immunological "fitness." These findings position CMVision as a valuable tool and highlight CMV-reactivity as a potential biomarker for vaccine readiness in cancer patients.
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