Inclusion criteria
The cases included in this study were identified in the ROHA. A case was defined as any patient under 19 years of age with a diagnosis of malignant tumor and SARS-CoV-2 disease confirmed by RT-PCR between April 12, 2020 (epidemiological week [EW] 16) and March 5, 2022 (epidemiological week 9) and resident in Argentina at the time of diagnosis.