RecruitingClinical trialWhole Exome Sequencing in Finding Causative Variants in Germline DNA Samples From Patients With Congestive Heart Failure Receiving Therapy for Breast CancerThis research trial studies whole exome sequencing in finding causative variants in germline deoxyribonucleic acid (DNA) samples from patients with congestive heart failure receiving therapy for breast cancer. Studying samples of germline DNA in the laboratory from patients with congestive heart failure receiving therapy for breast cancer may help doctors learn more about changes that occur in DNA and identify biomarkers related to congestive heart failure.