A Study About How Blood Cell Growth Patterns Relate to Heart Health After Treatment for Hodgkin Lymphoma

PRIMARY OBJECTIVES: I. To assess the prevalence of therapy-related clonal hematopoiesis (t-CH) possessing somatic mutations associated with cardiovascular disease (CVD) in anthracycline exposed pediatric classical Hodgkin Lymphoma patients detected after front line Hodgkin Lymphoma therapy. II. To compare rates of t-CH possessing somatic mutations associated with CVD between anthracycline exposed pediatric classical Hodgkin Lymphoma patients with versus without objective signs of CVD according to cardiac magnetic resonance imaging (MRI). SECONDARY OBJECTIVES: I. To evaluate whether the incidence of t-CH possessing somatic mutations associated with CVD increases over time among pediatric classical Hodgkin Lymphoma patients previously treated with anthracyclines. II. To compare rates of objective findings of CVD between groups of anthracycline exposed pediatric classical Hodgkin Lymphoma patients with versus without clinical risk factors for CVD. EXPLORATORY OBJECTIVES: I. To compare the prevalence of t-CH with mutations associated with CVD between anthracycline exposed pediatric classical Hodgkin Lymphoma patients who received versus did not receive mediastinal radiation as part of their initial treatment. II. To assess whether specific patient characteristics and other treatment components (age, sex, race, dexrazoxane usage, etc.) are associated with an increased likelihood of t-CH with mutations associated with CVD. III. To evaluate the effect of t-CH with mutations associated with CVD on objective findings of CVD, as adjusted for or mediated by other factors such as patient characteristics and clinical conditions associated with an elevated risk for CVD. OUTLINE: This is an observational study. Patients undergo collection of blood samples, complete surveys, and undergo cardiac MRI on study. Patients also have their medical records reviewed and may have archived blood samples collected if available.