SOUTH SAN FRANCISCO, Calif. (AP) _ Calithera Biosciences Inc. (CALA) on Tuesday reported a loss of $3.1 million in its second quarter.

The South San Francisco, California-based company said it had a loss of 9 cents per share.

The results exceeded Wall Street expectations. The average estimate of three analysts surveyed by Zacks Investment Research was for a loss of 33 cents per share.

The drug developer posted revenue of $17.1 million in the period.

In the final minutes of trading on Tuesday, the company's shares hit $4.45. A year ago, they were trading at $14.95.

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This story was generated by Automated Insights (http://automatedinsights.com/ap) using data from Zacks Investment Research. Access a Zacks stock report on CALA at https://www.zacks.com/ap/CALA