AbbVie Inc.’s stock ABBV, -0.41% fell 0.5% early Monday, after the drug company lowered its first-quarter guidance to reflect the dilutive impact of its closure of the acquisition of ImmunoGen. The company said it now expects first-quarter per-share earnings to range from $2.26 to$2.30, down from prior guidance of $2.30 to$2.34, including a 4 cent per share dilutive impact from the Immunogen deal. AbbVie announced the $10.1 billion all-cash deal for Immunogen in November, that includes ImmunoGen’s antibo ...