Serum correlates of the placebo effect in irritable bowel syndrome.

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Serum correlates of the placebo effect in irritable bowel syndrome.

Kokkotou, E., Conboy, L.A., Ziogas, D.C., Quilty, M.T., Kelley, J.M., Davis, R.B., Lembo, A.J., Kaptchuk, T.J.

Journal		Neurogastroenterol Motil.
Species
Analytes Measured		MMP-9 , Osteoprotegerin , TIMP-1 , TWEAK , Flt-1 VEGFR1
Matrix Tested		Serum

Year		2010
Volume		22
Page Numbers		285-e81
Application		Cytokines and Chemokines

Abstract

BACKGROUND In diseases defined primarily by the subjective nature of patient self-report, placebo effects can overwhelm the capacity of randomized controlled trials to detect medication-placebo differences. Moreover, it is unclear whether such placebo effects represent genuine psychobiological phenomena or just shifts in selective attention. Knowledge of predictors of the placebo response could improve the design of clinical trials and the delivery of personalized medical care.

METHODS In patients with irritable bowel syndrome (IBS), a subset of our previous study that were randomized to placebo treatment (sham acupuncture) or no-treatment group (waitlist), we tested an enriched panel of 10 serum biomarkers at the enrolment and the 3rd week of intervention, using a multiplex electrochemiluminescent immunoassay.

KEY RESULTS More pronounced changes overtime in serum levels of osteoprotegerin (OPG) have been found in patients who received placebo treatment compared with the waitlist group (P = 0.039). Moreover, serum levels of OPG at baseline were found to be higher (P = 0.0167) in patients who subsequently achieved adequate relief (AR) of their IBS symptoms, independently of their treatment group. Besides, serum levels of TNF-related weak inducer of apoptosis (TWEAK) at baseline were also higher (P = 0.0144) in patients who reported AR and in particular in those who received the placebo treatment.

CONCLUSIONS & INFERENCES These two measurable biological parameters associated with placebo, namely serum OPG and TWEAK, provide a proof of principle for discovering putative molecular signatures of placebo response in IBS and perhaps in other illnesses with patient self-reported outcomes.

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Serum correlates of the placebo effect in irritable bowel syndrome.

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