Inclusion Criteria:  Adults aged 18 and older Able to read, speak and consent in English Diagnosis of diffuse large b-cell lymphoma Confirmed treatment with tisagenlecleucel (Kymriah) Internet access via smartphone, tablet, a computer, or another device with the capacity to receive calls, texts, or e-mails, as well as the electronic study assessments.  Exclusion Criteria:  Individuals who are terminally ill, defined as individuals identified by their physician as likely having 6 months or less to live, or those individuals transitioned to comfort measures only (meaning only supportive care measures without curative focused treatment) Individuals for whom there is documentation of inability to provide consent in the medical record