Comparison of Momelotinib, Pacitinib and Ruxolitinib in patients with Myeloproliferative Neoplasm: An Indirect-Comparison Meta-Analysis of Randomized Controlled Trials
Abstract Background The meta-analysis compared the efficacy and safety of momelotinib, ruxolitinib and pacitinib in patients with myeloproliferative neoplasms(MPN), which includes essential thrombocythemia, polycythemia vera and primary myelofibrosis. Methods We searched multiple databases and collected relevant studies before Dec. 20,2019. According to predefined criteria, we included eight qualified phase 3 randomized controlled trials with 2125 patients in the meta-analysis. Statistical analysis used StataMP14 and Indirect Treatment Comparisons software. The meta-analysis is registered with PROSPERO, number CRD42020164271. Results The relative risk (95%confidence interval) of momelotinib vs ruxolitinib, ruxolitinib vs pacritinib and momelotinib vs pacritinib by indirect-comparison are as follows: The RR(95%CI) for ≥ 35% reduction in spleen volume from baseline at week 24/32 as determined by magnetic resonance imaging or computed tomography were 0.93(95%CI0.69-1.25), 10.87(95%CI2.52-46.79) and 10.09(95%CI2.27- 44.74); The RR(95%CI) for ≥ 50% reduction in total symptom score from baseline at week 24–32 assessed using the modified Myelofibrosis Symptom Assessment Form were 1.61(95%CI0.25-10.15), 4.40(95%CI2.13-9.09) and 7.12 (95%CI0.91-55.41); The RR(95%CI) for the risk of anemia were 0.60(95%CI0.20-1.85), 0.80(95%CI0.56-1.14) and 0.48 (95%CI0.15-1.56); The RR(95%CI) for thrombocytopenia were 0.69(95%CI0.50-0.96), 1.33(95%CI0.77-2.30) and 0.92(95%CI0.48-1.74); The RR (95%CI) for the risk of fatigue were 1.07(95%CI0.71-1.59), 0.82(95%CI0.49-1.37) and 0.88(95%CI0.46-1.68); The RR(95%CI) for the risk of diarrhea were 1.32(95%CI0.58-3.01), 0.11(95%CI0.03-0.46) and 0.39(95%CI0.15-1.02); The RR(95%CI) for abdominal pain were 0.95(95%CI0.61-1.48), 0.83(95%CI0.30-2.25) and 0.78(95%CI0.26-2.35). The RR(95CI) for the improvement of transfusion-independent of pacritinib vs ruxolitinib was 6.36 (95%CI0.79-50.98). Conclusions Excluding the improvement of transfusion-independent and the risk of thrombocytopenia, pacritinib had relatively poorer efficacy and higher risk of adverse events compared with momelotinib or ruxolitinib. Momelotinib had similar or better efficacy and similar or lower risk of adverse events than ruxolitinib while excluding the risk of diarrhea. In general, momelotinib has the best potential therapeutic value in patients with MPN among the three drugs, but further clinical studies are needed to prove it.