cell phones and cancer

So is there enough research to suggest that those susceptible to cancer will be at increased risk with exposure to the rf waves of cellphones? The following study says yes: http://www.electric-words.com/cell/radiation/adelaide.html

However, a similar study using ‘normal’ DNA says no: http://www.sciencedaily.com/releases/2002/06/020626071255.htm
and this: http://www.sciencedaily.com/releases/2000/12/001220081206.htm
So, based on this, should we instill some sort of new regulation? Can we knoe who suceptible to cancer and provide warnings based on this? Or is there even a good link between the two?