PPIA and neuroblastoma: In-depth statistical analysis of datasets of non-SARS-CoV-2 infected neuroblastoma patients, to identify key genes involved with SARS-CoV-2 infection as possible neuroblastoma prognostic and infection biomarkers, has demonstrated that overexpression of ACE2, CD147, PPIA, and PPIB is significantly associated with poor-prognosis neuroblastomas [12].