No advantage of A beta 42-lowering NSAIDs for prevention of Alzheimer dementia in six pooled cohort studies.
BACKGROUND
Observational studies show reduced incidence of Alzheimer dementia (AD) in users of nonsteroidal anti-inflammatory drugs (NSAIDs). One hypothesis holds that the subset of NSAIDs known as selective A beta(42)-lowering agents (SALAs) is responsible for this apparent reduction in AD risk.


METHODS
We pooled individual-level data from six prospective studies to obtain a sufficient sample to examine AD risk in users of SALA vs non-SALA NSAIDs.


RESULTS
Of 13,499 initially dementia-free participants (70,863 person-years), 820 developed incident AD. Users of NSAIDs (29.6%) showed reduced risk of AD (adjusted hazard ratio [aHR] 0.77, 95% CI 0.65-0.91). The point estimates were similar for SALAs (aHR 0.87, CI 0.72-1.04) and non-SALAs (aHR 0.75, CI 0.56-1.01). Because 573 NSAID users (14.5%) reported taking both a SALA and non-SALA, we examined their use alone and in combination. Resulting aHRs were 0.82 (CI 0.67-0.99) for SALA only, 0.60 (CI 0.40-0.90) for non-SALA only, and 0.87 (CI 0.57-1.33) for both NSAIDs (Wald test for differences, p = 0.32). The 40.7% of participants who used aspirin also showed reduced risk of AD, even when they used no other NSAIDs (aHR 0.78, CI 0.66-0.92). By contrast, there was no association with use of acetaminophen (aHR 0.93, CI 0.76-1.13).


CONCLUSIONS
In this pooled dataset, nonsteroidal anti-inflammatory drug (NSAID) use reduced the risk of Alzheimer dementia (AD). However, there was no apparent advantage in AD risk reduction for the subset of NSAIDs shown to selectively lower A beta(42), suggesting that all conventional NSAIDs including aspirin have a similar protective effect in humans.
Johns Hopkins Bloomberg School of Public Health, Baltimore, MD 21205, USA.
C A
CA
Szekely
R C
RC
Green
J C S
JC
Breitner
T
T
Østbye
A S
AS
Beiser
M M
MM
Corrada
H H
HH
Dodge
M
M
Ganguli
C H
CH
Kawas
L H
LH
Kuller
B M
BM
Psaty
S M
SM
Resnick
P A
PA
Wolf
A B
AB
Zonderman
K A
KA
Welsh-Bohmer
P P
PP
Zandi
D000082:Acetaminophen / Q000627:therapeutic use; D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000544:Alzheimer Disease / Q000517:prevention & control*; D016229:Amyloid beta-Peptides / Q000378:metabolism*; D018712:Analgesics, Non-Narcotic / Q000627:therapeutic use; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000627:therapeutic use*; D001241:Aspirin / Q000627:therapeutic use; D015331:Cohort Studies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D018696:Neuroprotective Agents / Q000627:therapeutic use*; D010446:Peptide Fragments / Q000378:metabolism*; D016016:Proportional Hazards Models; D011446:Prospective Studies; D012307:Risk Factors
D016229:Amyloid beta-Peptides; D018712:Analgesics, Non-Narcotic; D000894:Anti-Inflammatory Agents, Non-Steroidal; D018696:Neuroprotective Agents; D010446:Peptide Fragments; C075222:amyloid beta-protein (1-42); D000082:Acetaminophen; D001241:Aspirin