Stockwatch: Pfizer, Roche, AZ, Novo Prolong Pharmaceutical Winter

Lackluster reports from Pfizer, Roche, AstraZeneca and Novo Nordisk in a second week of earnings season pervaded by below consensus 2017 guidance followed a first week punctuated by missed sales estimates. So much bad news hanging over the sector feels like a nuclear winter.

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Andy Smith gives an investor's perspective on industry news

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