Hospitalization and post-discharge survival outcomes of adolescents and young adults with cancer.

e18687 Background: Cancer incidence has increased among adolescents and young adults (AYA) over the last two decades. Younger patients often present with late diagnosis, aggressive disease, and are more likely to receive chemotherapy during cancer treatment. We investigated admission outcomes and post-discharge survival of AYA who were hospitalized after urgent admission. Methods: Retrospective cohort of patients with solid tumor diagnosis and age between 18 and 39 years, hospitalized after urgent admission to a tertiary, publicly-funded, cancer hospital in São Paulo, Brazil, from February 1st to December 31th 2021. We excluded patients with positive COVID-19 RT-PCR. We collected data on gender, cancer diagnosis, length of hospital stay, in-hospital mortality, chemotherapy infusion either before and during hospitalization; and last-follow up date and status. AYA admissions were compared to older adults (≥ 40 years [non-AYA]) admissions with chi-squared test. Overall survival (OS) after discharge between groups was analyzed with the log-rank test. Results: Of 4011 admissions, 312 were AYA. The median age was 34 (IQR 29-38) and most patients were female (63%). Compared to older adults (N = 3699), a higher proportion of AYA patients had breast cancer (25% vs 15%), central nervous system cancer (8.4% vs 2.6%), cervical cancer (12% vs 2.7%) and germinative cancer (4.5% vs 0.3%). The median length of hospital stay was 6 days (IQR 4-10). AYA were more likely to be under chemotherapy treatment during (11% versus 4%, p = 0.001) and within 30 days before hospitalization (32% vs 20%, p = 0.001). The overall in-hospital mortality rate was lower among AYA compared to older adults during the same period (12% vs 20%, p = 0.01). However, of those who died, a higher proportion were prescribed chemotherapy infusion before (38% vs 19%, p = 0.004) and during (15% vs 3.3%, p = 0.003) hospitalization; and a higher number of patients deceased on intensive-care unit beds, although the difference was not statistically significant (46% versus 36%, p = 0.2). Despite similar rates of 30-days readmissions (29% versus 26%, p = 0.3), AYA had better prognosis after discharge (mOS 295 days versus 181 days, p = 0.002). Conclusions: AYA patients had better hospitalization outcomes and were more likely to receive aggressive care near the end of life. Despite similar rates of early (≤ 30 days) readmissions, AYA had higher median overall survival after discharge compared to older adults. These finding should be taken into consideration when discussing hospitalization goals during admission of AYA with cancer.