Analysis of the data showed a 24% increased risk of advanced cancer and 49% increased risk of early-stage disease for night workers compared with those who worked during the day.

BBC: 'Night shift link' to ovarian cancer

Read said Pfizer's mid- to late-stage drug pipeline "continues to strengthen with key potential opportunities, " including drugs for advanced breast cancer and three other types of cancer, one for high cholesterol and a meningococcal B vaccine for adolescents and young adults.

WSJ: Pfizer Q4 net jumps on sale of nutrition business