Characterizing mild cognitive impairment in incident Parkinson disease: the ICICLE-PD study

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OBJECTIVE: To describe the frequency of mild cognitive impairment (MCI) in Parkinson disease (PD) in a cohort of newly diagnosed incident PD cases and the associations with a panel of biomarkers.

METHODS: Between June 2009 and December 2011, 219 subjects with PD and 99 age-matched controls participated in clinical and neuropsychological assessments as part of a longitudinal observational study. Consenting individuals underwent structural MRI, lumbar puncture, and genotyping for common variants of COMT, MAPT, SNCA, BuChE, EGF, and APOE. PD-MCI was defined with reference to the new Movement Disorder Society criteria.

RESULTS: The frequency of PD-MCI was 42.5% using level 2 criteria at 1.5 SDs below normative values. Memory impairment was the most common domain affected, with 15.1% impaired at 1.5 SDs. Depression scores were significantly higher in those with PD-MCI than the cognitively normal PD group. A significant correlation was found between visual Pattern Recognition Memory and cerebrospinal β-amyloid 1-42 levels (β standardized coefficient = 0.350; p = 0.008) after controlling for age and education in a linear regression model, with lower β-amyloid 1-42 and 1-40 levels observed in those with PD-MCI. Voxel-based morphometry did not reveal any areas of significant gray matter loss in participants with PD-MCI compared with controls, and no specific genotype was associated with PD-MCI at the 1.5-SD threshold.

CONCLUSIONS: In a large cohort of newly diagnosed PD participants, PD-MCI is common and significantly correlates with lower cerebrospinal β-amyloid 1-42 and 1-40 levels. Future longitudinal studies should enable us to determine those measures predictive of cognitive decline.


  • Alison J Yarnall
  • David P Breen
  • Gordon W Duncan
  • Tien K Khoo
  • Shirley Y Coleman
  • Michael J Firbank
  • Cristina Nombela
  • Sophie Winder-Rhodes
  • Jonathan R Evans
  • James B Rowe
  • Brit Mollenhauer
  • Niels Kruse
  • Gavin Hudson
  • Patrick F Chinnery
  • John T O'Brien
  • Trevor W Robbins
  • Keith Wesnes
  • David J Brooks
  • Roger A Barker
  • David J Burn
  • ICICLE-PD Study Group
Enheter & grupper
Externa organisationer
  • University of Cambridge


Sidor (från-till)308-16
Antal sidor9
Utgåva nummer4
StatusPublished - 2014 jan 28
Peer review utfördJa