RecruitingPhase 2Drug trialA Study to Evaluate the Safety and Pharmacokinetics of Eflapegrastim in Pediatric Participants With Solid Tumors or Lymphomas and Treated With Myelosuppressive ChemotherapyThe purpose of this study is to evaluate the safety and pharmacokinetics of eflapegrastim in pediatric participants with solid tumors or lymphoma and treated with myelosuppressive chemotherapy.