The impact of granulocyte colony-stimulating factor use in patients with metastatic breast cancer treated with palliative chemotherapy: a single-institution retrospective review.

PURPOSE

The goal of chemotherapy for metastatic breast cancer (MBC) is palliation of symptoms while minimizing treatment-related toxicities. It remains unclear whether use of granulocyte colony-stimulating factor (G-CSF) to maintain relative dose intensity of chemotherapy for MBC is associated with improved clinical outcomes.

METHODS

The medical records of MBC patients treated with chemotherapy in 1st-3rd-line settings between May 2010 and April 2014 were reviewed. Time to progression (TTP), progression-free survival (PFS), and overall survival (OS) were compared between patients who received G-CSF and those who did not. Antibiotic use, total clinic visits, and pre- and post-treatment Eastern Cooperative Oncology Group (ECOG) performance status were also compared between the groups.

RESULTS

Of the 169 patients included, 55 (32.5%) received > 1 G-CSF dose and 114 (67.5%) did not receive any G-CSF. The median TTP was similar between the two groups (5.0 months (95% CI 3.4-7.1) vs. 5.2 months (95% CI 4.8-6.2) respectively; p = 0.998). The median PFS (p = 0.955; 5.0 months (95% CI 3.4-5.9) vs. 5.2 months (95% CI 4.7-6.0), respectively) and OS (14.6 (95% CI 9.0-26.6) vs. 18.5 months (95% CI 15.2-22.0) in G-CSF and non-G-CSF groups, respectively; p = 0.628) were also similar between groups. No significant between-group differences were noted in rate of decline in ECOG performance status, antibiotic use, and number of clinic visits and hospitalizations.

CONCLUSION

This retrospective analysis did not find any evidence that the use of G-CSF to maintain chemotherapy dose intensity for the treatment of MBC improves TTP, PFS, and OS or results in improved ECOG performance status compared with lack of G-CSF use in patients with MBC treated in 1st to 3rd-line settings.