Computer network security company Sourcefire Inc. said Monday that its CEO, John Burris, has begun a leave to undergo treatment for colon cancer.

The company said Burris’ medical leave began Thursday. He has worked at Sourcefire since 2008 and will remain on the board. Company founder and Chief Technology Officer Martin Roesch will be interim CEO, but Burris will remain on the board and offer Sourcefire’s executives strategic input when possible.

Sourcefire also said raised its profit and revenue for its fiscal second quarter, which ended Saturday.

The company said April 30 that it expected to report adjusted earnings of 12 cents to 14 cents per share on revenue of $46.5 million to $48.5 million for the second quarter. It now expects to come in at the high end of those ranges or slightly above them, meaning it expects to meet or exceed the average forecast from analysts.

Analysts expect the company to report adjusted earnings of 14 cents per share on revenue of $48.6 million, according to FactSet.

Sourcefire shares rose $1, or 2 percent, to $52.40 Monday. In aftermarket trading the stock lost $1.65, or 3.2 percent, to $50.75.