Interesting study on selenium, BJ! I hope you can find the original study; were some of these people given a selenium supplement or was this just an observational study with the selenium level in the blood measured and then correlated with cancer risk?
A lot of us are doing a lot of sun exposure, or PUVA (me for 20 years+), or NBUVB, so we are probably more prone to skin cancer. If more studies in the future confirm this result, that would be great. In the mean time it is reasonable for us to take a selenium supplement, especially since as you pointed out people with psoriasis have low selenium levels in the blood.
Last week on the US forum you posted a lot of studies on selenium with respect to psoriasis and inflammation, some were positive others negative, so a bit confusing to know what to do, but I think on the whole it's a good idea for us to take selenium (you have for the past 6 years and you didn't die,

and your psoriasis didn't get worse from it).