THE BURNED OVER DISTRICT

For one company it was simple, just buy the rights to an "orphan drug", jack up the price a hundredfold, then market it for uses that are marginal at best but increase the volume of sales. Such is the business history of Questcor.

For several years, Questcor, which is based in Anaheim, lost money on Acthar because the drug’s market was so small. In 2007, it raised the price overnight, to more than $23,000 a vial, from $1,650, bringing the cost of a typical course of treatment for infantile spasms to above $100,000. It said it needed the high price to keep the drug on the market.

“We have this drug at a very high price right now because, really, our principal market is infantile spasms,” Don M. Bailey, Questcor’s chief executive, told analysts in 2009. “And we only have about 800 patients a year. It’s a very, very small — tiny — market.”

Companies often charge stratospheric prices for drugs for rare diseases — known as orphan drugs — and Acthar’s price is not as high as some. Society generally tolerates those costs to encourage drug companies to develop crucial, possibly lifesaving drugs for these often neglected diseases.

But Questcor did almost no research or development to bring Acthar to market, merely buying the rights to the drug from its previous owner for $100,000 in 2001. And while the manufacturing of Acthar is complex, it accounts for only about 1 cent of every dollar that Questcor charges for the drug.

Moreover, the tiny “orphan” market soon became much bigger. Before long, Questcor began marketing the drug for multiple sclerosis, nephrotic syndrome and rheumatologic conditions, even though there is little evidence that Acthar is more effective for those other conditions than alternatives that are far cheaper. And the company did so without being required to prove that the drug actually works. That is because Acthar was approved for use in 1952, before the Food and Drug Administration required clinical trials to show a drug is effective for a particular disease. Acthar is essentially grandfathered in.

Today, only about 10 percent of the drug’s sales are for infantile spasms. The new uses, Mr. Bailey has told analysts, represent multibillion-dollar opportunities for Acthar and Questcor, its sole maker.

The results have been beyond even the company’s wildest dreams. Sales of Acthar, which accounts for essentially all of Questcor’s sales, totaled nearly $350 million in the first nine months this year, up 145 percent from the period a year earlier. In the same period, Questcor’s earnings per share nearly tripled, to $2.12. In the five years after the big Acthar price increase in August 2007, Questcor shares rose from around 60 cents to about $50, in one of the best performances of any stock in any industry.

Aetna has stopped payment for any use beyond its original one and Questcor's salad days may be over, but the damage has been done.