Practical Measures of Clinical Benefit With Ruxolitinib Therapy: An Exploratory Analysis of COMFORT-I

Clin Lymphoma Myeloma Leuk. 2017 Aug;17(8):479-487. doi: 10.1016/j.clml.2017.05.015. Epub 2017 May 12.


Background: The phase III COMFORT (Controlled Myelofibrosis Study With Oral JAK inhibitor Treatment)-I and COMFORT-II trials in patients with intermediate-2 or high-risk myelofibrosis (MF) showed that ruxolitinib was superior to placebo and best available therapy, respectively, for improvements in spleen volume, MF-related symptoms, and overall survival (OS). However, patients managed in community settings might not have access to the methods used in the COMFORT trials. In this exploratory analysis we summarize efficacy findings of COMFORT-I using practical, community-oriented measures of patient outcomes.

Patients and methods: In this post hoc analysis of data from COMFORT-I we evaluated changes from baseline to week 12 in spleen size (palpable length and volume), patient-reported outcomes (Patient Global Impression of Change; Myelofibrosis Symptom Assessment Form; Patient-Reported Outcomes Measurement System Fatigue Scale), body weight, and serum albumin levels in 5 subgroups of ruxolitinib-treated patients on the basis of week 12 spleen length changes from baseline: (1-4) ≥ 50%, 25% to < 50%, 10% to < 25%, or < 10% reduction; and (5) worsening. OS was evaluated in ruxolitinib-treated patients with week 12 spleen length reductions from baseline ≥ 50%, 25% to < 50%, or < 25% (including worsening).

Results: In all spleen length subgroups, including patients with worsening spleen length at week 12, ruxolitinib (n = 150) was associated with improvements in spleen volume, patient-reported symptom burden, body weight, and serum albumin levels. Greater reductions in spleen length were associated with prolonged OS.

Conclusion: A variety of assessment methods beyond palpable spleen length that are easily accessible in the community setting might be useful in evaluating the clinical benefit of ruxolitinib over time in patients with MF.

Trial registration: NCT00952289.

Keywords: Community hospitals; Janus kinases; Myelofibrosis; Myeloproliferative disorders; Splenomegaly.

Publication types

  • Clinical Trial, Phase III
  • Research Support, Non-U.S. Gov't
  • Research Support, N.I.H., Extramural

MeSH terms

  • Aged
  • Biomarkers
  • Blood Transfusion
  • Combined Modality Therapy
  • Disease Management
  • Female
  • Humans
  • Male
  • Middle Aged
  • Primary Myelofibrosis / diagnosis
  • Primary Myelofibrosis / drug therapy*
  • Primary Myelofibrosis / mortality
  • Protein Kinase Inhibitors / administration & dosage
  • Protein Kinase Inhibitors / adverse effects
  • Protein Kinase Inhibitors / therapeutic use*
  • Pyrazoles / administration & dosage
  • Pyrazoles / adverse effects
  • Pyrazoles / therapeutic use*
  • Quality of Life
  • Spleen / pathology
  • Survival Analysis
  • Treatment Outcome


  • Biomarkers
  • INCB018424
  • Protein Kinase Inhibitors
  • Pyrazoles

Associated data