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Maria Madeleine Rüthrich, Yascha Khodamoradi, Julia Lanznaster, Melanie Stecher, Lukas Tometten, Florian Voit, Carolin E.M. Koll, Stefan Borgmann, Jörg Janne Vehreschild, Björn-Erik Ole Jensen, Frank Hanses, Clemens Gießen-Jung, Kai Wille, Marie von Lilienfeld-Toal, Gernot Beutel

• \(\bf Introduction:\) Active malignancies have been identified as an independent risk factor for severity and mortality in COVID-19. However, direct comparisons between SARS-CoV-2-infected patients with active (acP) and non-active cancers (n-acP) remain scarce. \(\textbf {Patients and Methods:}\) We retrospectively analyzed a cohort of cancer patients with PCR-confirmed SARS-CoV-2 infection, enrolled from March 16, 2020, to July 31, 2021. Data on demographics, cancer, and laboratory findings were collected. Descriptive and subsequent regression analyses were performed. Endpoints were “deterioration to severe COVID-19” and "infection-associated mortality". \(\bf Results:\) In total, 987 cancer patients (510 acP vs. 477 n-acP) were included in our analysis. The majority was >55 years old, more men than women were included. At detection of SARS-CoV-2, 65.5% of patients had mild/moderate symptoms, while deterioration to severe COVID-19 was slightly more common in acP (19 vs. 16%; \(\it p\) = 0.284). COVID-19-associated mortality was significantly higher in acP (24 vs. 17.5%, \(\it p\)p < 0.001). In terms of laboratory tests, severe cytopenia and elevated levels of inflammatory markers were common findings in acP at baseline, particularly in those who developed a severe infection or died. Multivariate analysis revealed that ferritin (HR 14.24 [2.1–96], \(\it p\) = 0.006) and CRP (HR 2.85 [1.02–8.02], \(\it p\) = 0.046) were associated with severity and mortality. In n-acP, association was seen for ferritin only (HR 4.1 [1.51–11.17], \(\it p\) = 0.006). \(\bf Conclusion:\) Comparing patients with active and non-active cancer, the former showed higher mortality rates. Also, inflammatory markers were significantly increased, assuming higher levels of inflammation may play a role in the adverse outcome of COVID-19 in aCP.