Analyses of efficacy end points in a controlled trial of interferon-gamma1b for idiopathic pulmonary fibrosis.

Abstract:

BACKGROUND:Idiopathic pulmonary fibrosis (IPF) is a devastating disease, yet validated, reliable criteria for evaluating patient response to therapies in clinical trials are lacking. METHODS:To optimize selection of end point criteria for the study of interferon (IFN)-gamma1b in patients with IPF, we retrospectively analyzed the components of the primary efficacy end point used in a large, controlled study of 330 patients for reliability, validity, and sensitivity to treatment effect. The primary end point components were death, disease progression defined as a > or = 5 mm Hg increase in resting alveolar-arterial oxygen pressure gradient (P[A-a]O2), and disease progression defined as a > or = 10% decrease in percentage of predicted FVC. RESULTS:We found that the P(A-a)O2 criterion was not reliable and was not associated with mortality. In contrast, the FVC criterion was reliable and was associated with a 2.4-fold increase in the risk of death. Of the three measures, only mortality was sensitive to a treatment effect of IFN-gamma1b. Additionally, the tendency for mortality benefit was observed in nearly all patient subgroups defined by baseline physiology. The effect of IFN-gamma1b on mortality was strongest in patients with baseline percentage of predicted FVC > or = 55% (p = 0.004) or percentage of predicted diffusing capacity of the lung for carbon monoxide > or = 30% (p = 0.008). CONCLUSION:We conclude that mortality is the most inclusive end point for future trials of IFN- gamma1b in patients with IPF, and that a > 10% decrement in the percentage of predicted FVC represents a valid measure of disease progression.

journal_name

Chest

journal_title

Chest

authors

King TE Jr,Safrin S,Starko KM,Brown KK,Noble PW,Raghu G,Schwartz DA

doi

10.1378/chest.127.1.171

subject

Has Abstract

pub_date

2005-01-01 00:00:00

pages

171-7

issue

1

eissn

0012-3692

issn

1931-3543

pii

S0012-3692(15)32389-8

journal_volume

127

pub_type

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