Time from Final Oncologist Visit to Death and Palliative Systemic Treatment Use Near the End of Life in Heavily Pretreated Patients with Luminal Breast Cancer

<b>Background</b>: Palliative care must be tailored for patients with extended disease trajectories, such as those with hormone receptor-positive, Human Epidermal Growth Factor Receptor 2 (HER2)-negative advanced breast cancer (ABC), including the appropriate timing of discontinuing treatment. This study aimed to assess the interval between the last oncologist visit and death and the application of systemic treatment near the end of life in this patient population. <b>Methods</b>: This retrospective study included patients with luminal ABC who received at least two lines of palliative systemic treatment at the National Research Institute of Oncology in Poland, and died between November 2020 and March 2024. <b>Results</b>: Seventy-six women, with a median age 62.8 years (range: 35.3-91.5), were included. The median number of prior palliative systemic treatment lines was three (range: 2-6). At their last recorded oncologist visit, 75% of the patients were receiving active treatment (53% with hormonal therapy and 22% with chemotherapy). Only 25% were under continuous palliative care at this visit. Treatment was administered within the last month of life to 53% of the patients. The median duration from the last oncologist visit to death was 23 days (range: 0-408). The duration of this time interval was only associated with the performance status at the last visit (<i>p</i> < 0.05). <b>Conclusions</b>: Oncologists frequently delay the recognition of the need to discontinue systemic therapy. Patients with luminal HER2-negative ABC may be offered numerous effective lines of systemic treatment, complicating this decision further. Implementing clearer guidelines for end-of-life care for this group and providing proper training for healthcare providers is essential.