Retention Rate of the Anti-TNF Biologics in the Treatment of Rheumatic Diseases and Predictive Factors for Drug Withdrawal: Data From the
Hong Kong Biologics Registry.
Background/Purpose: To study the retention rate of the anti-TNF
biologics in the treatment of rheumatic diseases and the associated factors for
drug withdrawal
Methods: Data on the use of biological agents for the treatment of various
rheumatological disorders in 14 public hospitals were collected prospectively.
Efficacy data, serious adverse events, withdrawal of biologics and reasons for
withdrawal were collected at regular time intervals. The cumulative retention
rate of individual agent was studied by the Kaplan-Meier method and factors
associated with drug withdrawal were studied by Cox regression.
Results: From 2005 to 2012, 1335 courses of anti-TNF biological agents
in 991 patients with rheumatic diseases were used. There were 553 women
and 438 men (mean age 44.9_13.9 years and duration of underlying disease
7.4_6.6 years). Underlying rheumatic diseases were: rheumatoid arthritis(
RA) (50%), spondyloarthropathy (SpA)(37%), psoriatic arthritis(PSA)
(11%) and others (2%). The initial choice of the anti-TNF biologics was:
infliximab (IFX) (N_618, 46%), etanercept (ETN) (N_468, 35%), adalimumab
(ADA) (N_208, 16%) and golimumab (GLM) (N_41, 3%). The
dosages of the biologics used were: IFX (intravenous; 3–5mg/kg for RA,
5mg/kg for SpA and PSA), ETN (subcutaneous; 50mg/week or 25mg
2x/week), ADA (subcutaneous; 40mg every 2 weeks) and GLM (subcutaneous;
50mg every 4 weeks). The mean duration of administration per course of
biologic was 20.1_19.7 months. 692 (52%) courses of anti-TNF agents were
abbreviated because of the following reasons: 238 (34%) lack /loss of efficacy
(primary or secondary failure); 185 (27%) serious adverse events; 123 (18%)
financial reasons; and 146 (21%) other or unspecified reasons. The overall
cumulative drug withdrawal rate (due to either lack /loss of efficacy or
adverse events) at 12, 24 and 36 months was 28%, 39% and 46% for IFX, and
22%, 27% and 32% for ETN, and 23%, 27% and 34% for ADA, respectively
(log rank test; p_0.005 between IFX and either ETN or ADA). When drug
withdrawal was broken down into that due to loss of efficacy and adverse
events, data remained significant in favor of ETN to IFX. The follow-up time
of ADA users was significantly shorter than those of ETN, and there was no
significantly difference in the withdrawal rates between ETN and ADA. The
commonest reasons for drug withdrawal because of serious adverse events
were: allergic skin reaction (3.6%), infusion/injection site reactions (2.1%)
and tuberculous infection (1.9%). Among 26 patients who developed tuberculosis,
21 patients were IFX users, 4 were ETN users and 1 was GLM user.
Patients with RA had significantly lower drug retention rate than SpA or PSA
patients (log rank test; p_0.05). Cox regression analysis revealed that the
anti-TNF agent used (IFX versus ETN/ADA/GLM; HR 1.46 [1.17–1.81]; p0.001) and rheumatoid arthritis (vs other diagnoses; HR 1.47 [1.13–1.93];
p0.005) was independent predictors for drug withdrawal due to inefficacy
or serious adverse events after adjustment for age, sex and disease duration.
Conclusion: Our Registry data reveals that IFX is associated with a
significantly higher withdrawal rate for both loss of efficacy over time and the
development of serious adverse events, in particular tuberculosis.
相关链接:英夫利昔单抗停药率较高与严重不良事件有关
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