Myelosuppression and healthcare utilization among patients with chemotherapy-treated extensive-stage small cell lung cancer (ES-SCLC) with and without trilaciclib from community oncology practices.

Abstract

527 Background: Trilaciclib has been recently approved for decreasing chemotherapy-induced myelosuppression among adults with ES-SCLC when administered prior to chemotherapy in US. The objective of this study was to estimate the reduction in myelosuppression with trilaciclib use using real-world data. Methods: This study compared ES-SCLC patients receiving trilaciclib and chemotherapy (T) during Feb 2021- Jan 2023 to a comparison cohort not receiving trilaciclib (C) during Apr 2020 – Jan 2023 using EMOL Health’s database, which includes >7 million patients from > 500 community oncology practices. The C cohort was matched to the T cohort based on age, chemotherapy, and line of therapy. Index date was the date of trilaciclib initiation for the T cohort and the date of chemotherapy initiation for the C cohort. Primary outcome measures were the number of events in grade ≥3 myelosuppression (in ≥1, ≥2, 3 lineages). Poisson regression models used to estimate the reduction in risk between the groups. Descriptive statistics of grade ≥3 myelosuppression, cytopenia-related healthcare utilization, and all-cause healthcare resource utilization are presented. Results: 77 T patients and 77 C patients were identified. Demographics and baseline clinical characteristics were similar (age 69.6 vs. 70.8, female 48.1% vs. 55.8% for T and C, respectively, ECOG 0/1 63.6% and 83.1% received 1st line treatment at index for both). Median duration of index treatment was 4 cycles for both cohorts. Rates of grade ≥3 myelosuppression in ≥1, ≥2, 3 lineages were estimated to be reduced in the T by 63.4% (95% CI: 44.1% - 76.7%, p < 0.001), 90.9% (95% CI: 74.7% - 97.8%, p < 0.001), and 91.9% (95% CI: 59.1% - 99.6%, p =0.016), respectively. T patients had lower prevalence of grade ≥3 myelosuppression in ≥1, ≥2, 3 lineages (11.5% vs. 27.1%; 1.2% vs. 11.7%; 0.4% vs. 4.4% per cycle) than C patients during index treatment (Table). Cytopenia-related healthcare utilization was also lower for T patients (G-CSF use 25.9% vs. 59.0%, ESA use 3.7% vs. 5.1%, blood transfusion 1.7% vs. 8.4%, platelet transfusion 1.2% vs. 2.6% per cycle during index treatment). Number of all-cause hospitalizations per patient was 0.35 for T vs. 0.51 for C during index treatment. Among those with ≥1 hospitalizations, median number of hospitalizations was 1.0 for T and 2.0 for C during index treatment. Conclusions: Results from this study suggest that trilaciclib reduces myelosuppression and cytopenia-related healthcare utilization among patients with ES-SCLC in the real world.[Table: see text]