The authors assessed the impact of statin use or non-use in combination with androgen-deprivation therapy among 87,346 men with advanced prostate cancer in the national VA database. On adjusted analysis, statin use was associated with a number of favorable outcomes, including overall survival (HR, 0.66), cancer-specific survival (HR, 0.56), and a longer time before onset of skeletal-related events (HR, 0.64).”
I've been on atorvastatin (40 mg per day) for several years prior to my cancer diagnosis. My PCP put me on it to control my cholesterol - which it has done pretty well. Whether it's done anything about my cancer (I'm also on lupron) is tough to tell, but I don't think it has.
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Statins
Statins. 
Statins reduce risk of developing PCa, as well as dying from it
Examining Bias in Studies of Statin Treatment and Survival in Patients With Cancer.
