CAMBRIDGE, Mass.--(BUSINESS WIRE)--Helicos BioSciences Corporation (NASDAQ: HLCS) announced today that it will report its financial results for the second quarter of 2007 on Tuesday, July 31, 2007, at 7:00 a.m. EDT, and hold a conference call at 9:00 a.m. EDT. Mr. Stanley Lapidus, Helicos’ president and chief executive officer, will lead the call.