Outcomes of tbo-filgrastim, filgrastim-sndz or filgrastim for mobilization in patients undergoing an autologous hematopoietic stem cell transplant: A single center experience.

Abstract

e19000 Background: Studies have reported that use of filgrastim (G) or any biosimilar result in similar stem cell yield during hematopoietic stem cell mobilization, but little is known on the effect of these biosimilars on length of hospitalization for the transplant procedure, engraftment, and long term survival of autologous hematopoietic stem cell transplant (HSCT) patients. Beginning January 2017, the Henry Ford Cancer Institute (HFCI) began utilizing tbo-filgrastim (TBO) and filgrastim-sndz (SNDZ) as part of mobilization. This study was conducted to evaluate transplant specific outcomes in HSCT patients comparing biosimilar and reference filgrastim products. Methods: This study retrospectively evaluated all patients treated at HFCI who received G-CSF based mobilization for HSCT between 1/2017 and 11/2018. Patient-, mobilization- and transplant specific variables were collected and analyzed. Results: A total of 113 patients underwent stem cell mobilization followed by collection and autologous HSCT. Of the 73 patients analyzed, 62% had a diagnosis of Multiple Myeloma (MM), 22% had Non-Hodgkin Lymphoma (NHL). Approximately 45% of patients received TBO, 44% received G and remainder received SNDZ. The percentage of patients who proceeded to HSCT was 86%. There was no difference in adequate CD34+ yield among the three G-CSF products (P = 0.074). There was no difference in mobilization associated complications including bone pain and thrombocytopenia. Plerixafor use was similar among the groups (P = 0.55). Actual CD34+ (P = 0.31) and the number of apheresis sessions required to collect an adequate CD34+ yield (P = 0.30) were not different among the groups. No significant differences were noted in time to neutrophil (P = 0.96) or platelet engraftment (P = 0.91) and hospital length of stay (P = 0.78). We found similar rates of infection, febrile neutropenia, and mucositis among the three groups. Relapse rates were also similar among the groups. Conclusions: In our institution transplant related outcomes were similar among patients who received TBO, SNDZ, and G as part of their pre-transplant mobilization protocol.