12059 Background: Hepatocellular carcinoma (HCC) disproportionately affects older adults who are often supported by informal or unpaid family caregivers (CGs). Despite rising incidence of advanced HCC worldwide, little is known about the experiences and unmet supportive needs of patients (pts) and their informal CGs, particularly in the context of contemporary first-line immunotherapy-based treatment. Methods: As part of two cross-sectional descriptive studies conducted in parallel at a single academic center, we interviewed non-dyadic older pts on systemic HCC treatment and family CGs and examined themes of informal caregiving. Eligible CGs were ≥18 years old and identified by pts; eligible pts were ≥60 years old and on systemic treatment for BCLC stage B or C HCC. CGs completed the Zarit Burden Interview (ZBI). Participants completed semi-structured interviews focused on pt and CG experiences and needs, which were transcribed and analyzed using an inductive approach by at least two investigators. Results: Transcripts (n=16) from 11/2021-11/2023 of interviews with CGs (n=8) and pts (n=8) were analyzed. CGs were 87.5% female. Their median ZBI score was 20/88, indicating little or no burden, although scores ranged from 2-64; higher scores indicate greater burden. Four themes emerged: CG tasks, sources of burden, sources of support, and views of palliative care. CG tasks included coordinating medical appointments and transport, attending appointments, advocating for pt interests, and helping with household chores. Two sources of burden most commonly identified were logistics of medical visits and supporting pts through physical and emotional symptoms. CGs recognized multiple sources of support, including spouses, family, friends, church groups, and therapists. Pts were 87.5% male, median aged 70, 25% Black, 50% non-Hispanic white, and 25% Hispanic. Their responses about caregiving, in contrast to the CGs interviewed, showed strong themes of independence. Representative quotes include, “I don’t need any help,” “I am independent..so far,” and “I live alone, I’ve got my own place, I do the best I can for myself.” Some shared that the support of CGs is more spiritual or emotional, “I feel stronger because you’re there,” which was needed mostly with new diagnoses or disease progression. Conclusions: Levels of burden varied among CG participants; pt participants felt independent for the most part while receiving their treatments, consistent with improved functional status and quality of life experienced by those receiving combination therapy. The task of juggling logistics for numerous medical visits between multiple subspecialties emerged as a major challenge. Strategies to optimize care coordination, including increased use of navigation for those with advanced HCC, may help pts and their CGs live better as they live longer on improved treatments.