Positivity and cancer progression: what's the evidence?

Here are two really interesting recent editorials about the role of positive attitudes in cancer progression.  One article harshly criticizes the "positive psychology" movement of lacking in scientific sophistication (Coyne & Tennen, 2010) and the other defends the research that has been done thus far (Aspinwall & Tedeschi, 2010). This is the most heated researchers get, very entertaining!