Overall survival of patients with COVID-19 and HCL. Probability of overall survival of 39 patients with hairy cell leukemia after COVID-19 diagnosis (A) and comparison of the survival of 17 patients who had a previous treatment with cladribine with 19 patients who received no treatment (B). Kaplan-Meier survival analysis made with Prism 9 version 9.3.1 (GraphPad 2021).