14 november 2018: lees ook dit artikel: 

https://kanker-actueel.nl/aspirine-ter-voorkoming-van-kanker-of-een-recidief-van-kanker-een-overzicht-van-studies-met-aspirine.html

20 augustus 2005: Bron: N Engl J Med. 2003 Mar 6;348(10):891- en N Engl J Med. 2003 Mar 6;348(10):883-90.

Aspirine in lage dosis - 81 mg. per dag - voorkomt significant recidief van darmadenomen bij geopereerde darmkankerpatiënten, blijkt uit gerandomiseerde studie onder 1121 darmkankerpatiënten verdeeld in drie groepen. Groep 1 kreeg een placebo, groep 2 nam elke dag 81 mg. aspirine en groep 3 nam iedere dag 325 mg. aspirine. In groep 1 werd binnen een jaar bij 47% een recidief geconstateerd, in groep 2 38% recidief en in groep 3 45% recidief. Het verschil in de twee groepen aspirine is wel opvallend omdat een eerdere studie heeft bewezen dat juist een hoge dosis aspirine , 325 mg. per dag , het risico op een recidief met 55% verlaagde. Wat de commentaren op deze studie zeggen hebben we geen toegang toe dus als u dat wilt weten zult u uw arts moeten vragen of die dit op kan vragen. wel heben we nnog een ander gerandomiseerde studie heironder geplatst die ook een verschil in riscio op rfecideif laat zien van 10% tussen 325 mg. aspirine per dag en placebo. Waarom in de eerst geplaatste studie dit verschil dan zoveel kleiner is is ons onduidlejik. Maar wellicht kan iemand ons dit verklaren?

Comment in
: ACP J Club. 2003 Nov-Dec;139(3):72-3.
N Engl J Med. 2003 Jun 12;348(24):2466-7; author reply 2466-7.
N Engl J Med. 2003 Jun 12;348(24):2466-7; author reply 2466-7.
N Engl J Med. 2003 Mar 6;348(10):879-80.

A randomized trial of aspirin to prevent colorectal adenomas.

Baron JA, Cole BF, Sandler RS, Haile RW, Ahnen D, Bresalier R, McKeown-Eyssen G, Summers RW, Rothstein R, Burke CA, Snover DC, Church TR, Allen JI, Beach M, Beck GJ, Bond JH, Byers T, Greenberg ER, Mandel JS, Marcon N, Mott LA, Pearson L, Saibil F, van Stolk RU.

Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, NH, USA. john.a.baron@dartmouth.edu

BACKGROUND: Laboratory and epidemiologic data suggest that aspirin has an antineoplastic effect in the large bowel.

METHODS: We performed a randomized, double-blind trial of aspirin as a chemopreventive agent against colorectal adenomas. We randomly assigned 1121 patients with a recent history of histologically documented adenomas to receive placebo (372 patients), 81 mg of aspirin (377 patients), or 325 mg of aspirin (372 patients) daily. According to the protocol, follow-up colonoscopy was to be performed approximately three years after the qualifying endoscopy. We compared the groups with respect to the risk of one or more neoplasms (adenomas or colorectal cancer) at least one year after randomization using generalized linear models to compute risk ratios and 95 percent confidence intervals.

RESULTS: Reported adherence to study medications and avoidance of nonsteroidal antiinflammatory drugs were excellent. Follow-up colonoscopy was performed at least one year after randomization in 1084 patients (97 percent). The incidence of one or more adenomas was 47 percent in the placebo group, 38 percent in the group given 81 mg of aspirin per day, and 45 percent in the group given 325 mg of aspirin per day (global P=0.04). Unadjusted relative risks of any adenoma (as compared with the placebo group) were 0.81 in the 81-mg group (95 percent confidence interval, 0.69 to 0.96) and 0.96 in the 325-mg group (95 percent confidence interval, 0.81 to 1.13). For advanced neoplasms (adenomas measuring at least 1 cm in diameter or with tubulovillous or villous features, severe dysplasia, or invasive cancer), the respective relative risks were 0.59 (95 percent confidence interval, 0.38 to 0.92) and 0.83 (95 percent confidence interval, 0.55 to 1.23).

CONCLUSIONS: Low-dose aspirin has a moderate chemopreventive effect on adenomas in the large bowel. Copyright 2003 Massachusetts Medical Society

Publication Types:
Clinical Trial
Multicenter Study
Randomized Controlled Trial

PMID: 12621133 [PubMed - indexed for MEDLINE]

N Engl J Med. 2003 Mar 6;348(10):883-90.

Erratum in:
N Engl J Med. 2003 May 8;348(19):1939.

Comment in:
ACP J Club. 2003 Nov-Dec;139(3):72-3.
N Engl J Med. 2003 Jun 12;348(24):2466-7; author reply 2466-7.
N Engl J Med. 2003 Mar 6;348(10):879-80.

A randomized trial of aspirin to prevent colorectal adenomas in patients with previous colorectal cancer.

Sandler RS, Halabi S, Baron JA, Budinger S, Paskett E, Keresztes R, Petrelli N, Pipas JM, Karp DD, Loprinzi CL, Steinbach G, Schilsky R.
Department of Medicine, University of North Carolina, Chapel Hill 27599-7555, USA. rsandler@med.unc.edu

BACKGROUND: Experimental studies in animals and observational studies in humans suggest that regular aspirin use may decrease the risk of colorectal adenomas, the precursors to most colorectal cancers.

METHODS: We conducted a randomized, double-blind trial to determine the effect of aspirin on the incidence of colorectal adenomas. We randomly assigned 635 patients with previous colorectal cancer to receive either 325 mg of aspirin per day or placebo. We determined the proportion of patients with adenomas, the number of recurrent adenomas, and the time to the development of adenoma between randomization and subsequent colonoscopic examinations. Relative risks were adjusted for age, sex, cancer stage, the number of colonoscopic examinations, and the time to a first colonoscopy. The study was terminated early by an independent data and safety monitoring board when statistically significant results were reported during a planned interim analysis.

RESULTS: A total of 517 randomized patients had at least one colonoscopic examination a median of 12.8 months after randomization. One or more adenomas were found in 17 percent of patients in the aspirin group and 27 percent of patients in the placebo group (P=0.004). The mean (+/-SD) number of adenomas was lower in the aspirin group than the placebo group (0.30+/-0.87 vs. 0.49+/-0.99, P=0.003 by the Wilcoxon test). The adjusted relative risk of any recurrent adenoma in the aspirin group, as compared with the placebo group, was 0.65 (95 percent confidence interval, 0.46 to 0.91). The time to the detection of a first adenoma was longer in the aspirin group than in the placebo group (hazard ratio for the detection of a new polyp, 0.64; 95 percent confidence interval, 0.43 to 0.94; P=0.022).

CONCLUSIONS: Daily use of aspirin is associated with a significant reduction in the incidence of colorectal adenomas in patients with previous colorectal cancer. Copyright 2003 Massachusetts Medical Society

Publication Types:
Clinical Trial
Multicenter Study
Randomized Controlled Trial

PMID: 12621132 [PubMed - indexed for MEDLINE]


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