Real-life experience of luspatercept in transfusion-dependent lower risk myelodysplastic syndrome patients

Abstract

Luspatercept has been approved for the treatment of anaemia in transfusion-dependent (TD) patients with lower risk (LR) myelodysplastic syndromes (MDS) after erythroid-stimulated agent (ESA) failure, according to the results of the MEDALIST trial. In this multicentre retrospective study, we report efficacy and safety data of luspatercept administered in 98 TD LR-MDS patients after ESA failure. The percentage of patients that stopped luspatercept due to adverse events was comparable to that reported in the MEDALIST study. Furthermore, we observed that 44.3% patients who had completed 24 weeks of follow-up achieved transfusion independence lasting longer than 8 weeks, compared to 38% in the MEDALIST trial. These positive results may be attributed to the inclusion of patients with lower transfusion needs in our study. All responses were observed within 8 months since luspatercept onset and many were long-lasting, even in the high-transfusion burden patient group. In addition, response to luspatercept and the presence of less than two mutations independently predicted for longer overall survival. Overall, our results confirm luspatercept's safety and efficacy in TD LR-MDS patients who have experienced ESA failure in a real-world setting.

Keywords: lower risk MDS; luspatercept; response; survival; transfusion dependence.

FIGURE 1

Mutation plot at baseline. In the RS+ group, 39 patients were SF3B1 ^mut and 10 were SF3B1 ^wt. In the RS− group, no patient was SF3B1 ^mut. Seventeen of 39 SF3B1 ^mut patients carried additional mutations. Six patients had no mutations. RS, ring sideroblasts.

FIGURE 2

(A) Percentage of patients achieving response. (B) Percentage of patients achieving response within each transfusion category. Forty‐two of 98 patients. HTB, high transfusion burden; ITB, intermediate transfusion burden; LTB, Low transfusion burden; TI, transfusion independence.

FIGURE 3

(A) Time to response (months). (B) Time to loss of response (months) in the 42 patients who had achieved a response.

FIGURE 4

Durable responses within the HTB group. HTB, high transfusion burden.

FIGURE 5

(Α) Overall survival (OS) probability according to response. (Β) OS probability according to mutation burden. HR, hazard ratio.