Placebo effect in chronic inflammatory demyelinating polyneuropathy: The PATH study and a systematic review

Richard A. Lewis, David R. Cornblath, Hans Peter Hartung, Gens Sobue, John Philip Lawo, Orell Mielke, Billie L. Durn, Vera Bril, Ingemar S.J. Merkies, Paul Bassett, Alexa Cleasby, Ivo N. van Schaik, A. Sabet, K. George, L. Roberts, R. Carne, S. Blum, R. Henderson, P. Van Damme, J. DemeestereS. Larue, C. D’Amour, P. Kunc, M. Valis, J. Sussova, T. Kalous, R. Talab, M. Bednar, T. Toomsoo, I. Rubanovits, K. Gross-Paju, U. Sorro, M. Saarela, M. Auranen, J. Pouget, S. Attarian, G. Le Masson, A. Wielanek, C. Desnuelle, E. Delmon, P. Clavelou, D. Aufauvre, J. Schmidt, J. Zschuentzsch, C. Sommer, D. Kramer, O. Hoffmann, C. Goerlitz, J. Haas, M. Chatzopoulos, R. Yoon, R. Gold, P. Berlit, A. Jaspert-Grehl, D. Liebetanz, A. Kutschenko, M. Stangel, C. Trebst, P. Baum, F. Bergh, J. Klehmet, A. Meisel, F. Klostermann, J. Oechtering, H. Lehmann, M. Schroeter, T. Hagenacker, D. Mueller, A. Sperfeld, F. Bethke, Israel V. Drory, A. Algom, D. Yarnitsky, B. Murinson, A. Di Muzio, F. Ciccocioppo, S. Sorbi, S. Mata, A. Schenone, M. Grandis, G. Lauria, D. Cazzato, G. Antonini, S. Morino, D. Cocito, M. Zibetti, T. Yokota, T. Ohkubo, T. Kanda, M. Kawai, K. Kaida, H. Onoue, S. Kuwabara, M. Mori, M. Iijima, K. Ohyama, M. Baba, M. Tomiyama, K. Nishiyama, T. Akutsu, K. Yokoyama, K. Kanai, I. N. van Schaik, F. Eftimov, N. C. Notermans, N. Visser, C. Faber, J. Hoeijmakers, K. Rejdak, U. Chyrchel-Paszkiewicz, C. Casanovas Pons, M. Antonia, J. Gamez, M. Salvado, C. Marquez Infante, S. Benitez, M. Lunn, J. Morrow, D. Gosal, T. Lavin, I. Melamed, A. Testori, S. Ajroud-Driss, D. Menichella, E. Simpson, E. Chi Ho Lai, M. Dimachkie, R. J. Barohn, S. Beydoun, H. Johl, D. Lange, A. Shtilbans, S. Muley, S. Ladha, M. Freimer, J. Kissel, N. Latov, R. Chin, E. Ubogu, S. Mumfrey, T. Rao, P. MacDonald, K. Sharma, G. Gonzalez, J. Allen, D. Walk, L. Hobson-Webb, K. Gable

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


The Polyneuropathy And Treatment with Hizentra (PATH) study required subjects with chronic inflammatory demyelinating polyneuropathy (CIDP) to show dependency on immunoglobulin G (IgG) and then be restabilized on IgG before being randomized to placebo or one of two doses of subcutaneous immunoglobulin (SCIG). Nineteen of the 51 subjects (37%) randomized to placebo did not relapse over the next 24 weeks. This article explores the reasons for this effect. A post-hoc analysis of the PATH placebo group was undertaken. A literature search identified other placebo-controlled CIDP trials for review and comparison. In PATH, subjects randomized to placebo who did not relapse were significantly older, had more severe disease, and took longer to deteriorate in the IgG dependency period compared with those who relapsed. Published trials in CIDP, whose primary endpoint was stability or deterioration, had a mean non-deterioration (placebo effect) of 43%, while trials with a primary endpoint of improvement had a placebo response of only 11%. Placebo is an important variable in the design of CIDP trials. Trials designed to show clinical improvement will have a significantly lower effect of this phenomenon than those designed to show stability or deterioration.

Original languageEnglish (US)
Pages (from-to)230-237
Number of pages8
JournalJournal of the Peripheral Nervous System
Issue number3
StatePublished - Sep 1 2020


  • CIDP
  • immunoglobulin
  • non-relapse
  • placebo
  • relapse

ASJC Scopus subject areas

  • Neuroscience(all)
  • Clinical Neurology


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