Bristol-Myers Squibb on Thursday cut its guidance for 2017, saying it now expects adjusted earnings of $2.70 to $2.90 a share for the year, down from its previous guidance of $2.85 to $3.05. In the fourth quarter, the drugmaker posted earnings of $894 million, or 53 cents a share, compared with a loss of $197 million, or a loss of 12 cents, a year earlier.