In the latest close session, Pacific Biosciences of California (PACB) was down 5.74% at $1.97. This change lagged the S&P 500's daily gain of 0.23%. Meanwhile, the Dow gained 0.34%, and the Nasdaq, a tech-heavy index, added 0.8%. The stock of maker of genetic analysis technology has risen by 67.2% in the past month, leading the Medical sector's gain of 5.57% and the S&P 500's gain of 3.57%.The investment community will be paying close attention to the earnings performance of Pacific Biosciences of Californi ...