The SCORE-NHL study is a prospective, multi-center, study designed to collect data and biological samples from participants diagnosed with aggressive Stage I to IV non-Hodgkin Lymphoma (NHL). Study participants will undergo research blood collections of up to 60 mL as well as residual tissue collection, collected as part of a standard of care procedure, for use in research. Collected samples and data will be analyzed to evaluate biomarkers associated with development and validation of cancer monitoring and detection assays ("Natera cancer monitoring and detection test(s)").