Shares of Puma Biotechnology (NASDAQ: PBYI) were up as much as 13% this week. As of Thursday afternoon, they were still up more than 10% for the week, according to data from S&P Global Intelligence.

The biotech company, which focuses on cancer therapies, closed at $4.40 a share last Friday. It opened on Monday at $4.35 and then got as high as $5.16 on Wednesday. The stock has a 52-week low of $1.60 and a 52-week high of $5.16.

On Tuesday, the company disclosed in a filing that Puma CEO Allan Auerbach bought 568,181 shares of Puma stock for roughly $2.5 million dollars and now owns 20% of the company. The choice was seen as a sign Auerbach has faith in the company's pipeline beyond its only marketed product, Nerlynx, used to treat HER2-positive breast cancer, a type of breast cancer that utilizes a protein called human epidermal growth factor receptor 2 (HER2). It is seen in one of every five breast cancer cases. The drug is also being examined to treat HER2-positive cervical cancer as well as non-small-cell lung cancer.

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Source Fool.com