"You can invest for all the right reasons and still get the wrong result," notes long-standing turnaround stock expert George Putnam, referring to the poor performance of the pharmaceutical sector in recent years.

Here, in his industry-leading The Turnaround Letter, he offers a fascinating review of 10 leading drug stocks which he now believes offer a combination of growth potential at "pretty cheap" valuations. Here is his overview.

"In 2000 and 2001, when the Internet boom was becoming a bust, many smart investors turned away from technology stocks and put their money into drug stocks. How could you go wrong with the big pharmaceutical companies?

"Demand for their products was growing as the population aged. These companies had huge research
and development programs that seemed to keep cranking out new blockbuster drugs. And most of them had great balance sheets, with many paying handsome dividends.

"Much of this reasoning has been borne out in the intervening years. Many large drug manufacturers have rung up substantial revenue gains over the last decade. So what's happened to the big drug stocks? With few exceptions they have gone sideways or down – in some cases down a lot.

Two leading advisors with noted expertise in the biotech sector have both been long-term fans of Celgene (NASDAQ: CELG), both holding the stock in their respective model portfolios.

Here, Nate Pile, editor of Nate's Notes, and John McCamant, editor of The Medical Technology Stock Letter, each take a look at the encouraging prospects for this biotechnology firm.

Nate Pile explains, "Now that the Pharmion merger is behind us, it appears that investors are once again
recognizing Celgene for what it is – namely, one of the premier stories in the biopharmaceutical space.

"As I have said a number of times before, if I could only own one biotech stock for the next ten years, Celgene would be it... and I encourage you to make it a 'first choice' for your portfolio as well!

"The stock is likely to exhibit its usual volatility around the company's upcoming earnings report, but I encourage you to take advantage of any sell-off that may occur to aggressively add to your position in this market leader. CELG is now considered a strong buy under $60 and a buy under $68."

John McCamant states, "Celgene had some good news of late on the thalidomide front. The company has received approval of the application to expand the drug's label to treat newly diagnosed multiple myeloma (MM) patients in Australia.