Figure 1.

Dose-dependent effects of IFN-α _2b or PDF on PC-3 cell growth. PC-3 cells were cultured with varying concentrations of either IFN-α_2b (0–100,000 IU/ml) or PDF (0–1,000 μg/ml) as indicated, and viable cell numbers in IFN-α_2b-treated (A) or PDF-treated (B) cases were determined at 72 h. All data represent mean ± SD (standard deviation) from three separate experiments (*p < 0.02; **p < 0.08).