Cancer
Ten RCTs reported the incidence of cancer; 391 diagnoses of
cancer or death from cancer occurred in 17 433 participants
(two of the trials reported no cancers). We found no evidence
that omega 3 fats had an effect on the incidence of cancer (1.07,
0.88 to 1.30) and there was no inconsistency (I2 = 0%) (fig 4). Five
trials and seven events remained on sensitivity analysis.
Seven cohort studies provided data on cancer (832 events in
the highest and lowest quantiles), and meta-analysis found no
effect of high versus low intake of omega 3