do artificial sweeteners, specifically aspartame, really cause cancer?

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there have been published studies that artificial sweeteners, specifically aspartame, caused a significant increase in leukemia and lymphoma among mice. but when the national cancer institute conducted its own studies, they say there is no relationship between artificial sweeteners and cancer in humans. the studies are never perfect; they of course have flaws. but given that the relationship between artificial sweeteners and cancer has been proven in mice to be statistically significant, what do you think of the studies done by National Cancer Institute? (see this article: htto://en.wikipedia.org/wiki/Aspartame_controversy. ) do you think the studies done by the National Cancer Institute are not sufficient and need improvement? Do you believe there should be no official statement until better studies are conducted? Share your views.