These three have secure core businesses, plus multiple paths to grow.Almost every portfolio needs a couple of anchor stocks that tend to grow consistently over time regardless of the mood of the market or the state of the economy. Thanks to the must-buy nature of lifesaving medicines and the regular launch of new and improved drugs, pharma stocks are a good place to look for the anchors that might be right for you.In that vein, there are three rock-solid pharma stocks in particular that are strong enough to ...