Biotech stocks give back 2015's gains

Biotech stock indices tumbled again on Monday, and now are in the red for the year.

The BioCentury 100 Index shed 405.61 (7%) to 5,671.92 on Monday. The index is down 31% since its July 20 peak of 8,161.20. For the year, the BioCentury 100 is down 5%. ...