Three biotech stocks were among the market's best-performing companies last week. Two of them are highly speculative, clinical-stage biotech stocks that surged on optimism about drugs in their pipelines. The third is commercial stage big-cap biotech stock that is racking up profit thanks to a fast-growing cancer drug.

It's anyone's guess whether these three biotech stocks will continue their winning ways in the months and years to come, but I've prepared a slideshow below that highlights what you need to know about PTC Therapeutics (PTCT -0.39%), Tesaro (NASDAQ: TSRO), and Pharmacyclics (NASDAQ: PCYC) and why each of them have recently surged by 25% or more.