A Randomized, 24 Week Parallel-group Placebo-controlled (Phase 2) Pilot-study of High Dose Omega 3 (DHA) in People at Risk for Dementia

Earlier trials with eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) have been moderately promising, but these interventions often suffered from relatively low DHA concentrations. In this trial, the investigators will use a DHA-rich dietary supplement formulated using a self-microemulsifying delivery system to accelerate absorption.

Modification of innate immune activity has already been seen using DHA-rich supplements, and this type of intervention has been shown to ameliorate AD-associated PBMC profiles, and to be associated with improvements in cognition. DHA can cross the BBB, and the resulting CSF concentrations are associated with reduced CSF total tau levels indicating that DHA reduce neurodegeneration, ameliorate Abeta42 induced neuronal damage, and increase microglia Abeta phagocytosis. However, pre-clinical and pre-dementia intervention trials linked to biomarkers for the AD disease process is lacking, and therefore, stratification with respect to stage of disease process has not been performed.

Study cohort: subjects in this pilot study will be recruited from the Norwegian Dementia Disease Initiative (DDI) cohort. The DDI cohort consists of 600 participants with Subjective Cognitive Dedcline (SCD), Mild Cognitive Impairment (MCI) and normal control subjects that have been included at dementia centres across Norway during 2012-2016. Blood samples and cerebrospinal fluid (CSF) have been collected and are stored centrally at Ahus. A comprehensive and highly standarized clinical assessment program has been administered by trained raters (assessors). The investigators are currently performing 2-year follow-up evaluations. Genetic data including APOE-isoforms have been collected as have baseline and follow-up MRIs, PET scans (so far in Oslo and Bergen) and baseline CSF examinations (Ab, total-tau and phosphorus-tau). Cognitive assessments at baseline and follow-up include MMSE and Clinical Dementia Rating (CDR), CERAD 10 word memory test, Clock drawing test, Trail Making Test A and B, Verbal fluency test (FAS), visual recognition test (VOSP silhouettes), Stropp Coloraturas-Word. Data is assembled in a customised database (UiO secure server (TSD)), developed based on XNAT (http://www.xnat.org) and also connected to pipelines for image analysis. A selection from CANTAB MCI test battery including RTI (reaction time), PAL (paired associates learning test), and SWM (spatial working memory).

Study design: All subjects included in the intervention study will have completed 2-year follow-up in the DDI study prior to inclusion and will be on stable medication at least 3 months prior to baseline examinations. Based on the existing electronic CRF for DDI, social e-RCT-CRFs will be developed and programmed into the proprietary XNAT database. Patients fulfilling the inclusion criteria will be identified by a nurse at the memory outpatient clinics and will be given a short information letter regarding the study. Written consent will be asked for. Thereafter, a medical and neurological examination of the patient will be performed, including a medical history and medication use.

This initial pilot study is a minor feasibility study with 40 subjects randomised equally to either of 2 treatment groups for 24 weeks,