By Joseph Walker 

Vertex Pharmaceuticals Inc., one of biotechnology's most richly valued companies, faces a big test Tuesday in proving it can become consistently profitable and live up to its $30 billion market capitalization.

A Food and Drug Administration advisory committee will consider whether to recommend approval of Vertex's experimental cystic-fibrosis drug, Orkambi, which analysts predict could help the company earn more than $8 billion in net profit over the next four years if it reaches the market.

Of the top 10 largest biotech companies by market value, Vertex is the only one to not turn a profit last year. The company, which was founded in 1989 and has one drug on the market, had lost an accumulated $4.9 billion as of March 31.

But Vertex's share price has doubled over the past year, the result of high expectations for Orkambi. If approved, J.P. Morgan projects the drug will reach global sales of $1.6 billion next year and $4.2 billion in 2020. Analysts widely expect the drug to receive a positive recommendation on Tuesday, and final FDA clearance by July.

The FDA meeting, to be held in Gaithersburg, Md., will be closely watched by health insurers and pharmacy-benefit managers who are concerned that Orkambi will be the latest high-priced blockbuster to strain their budgets. Vertex hasn't announced a price yet, but J.P. Morgan predicts the company will charge a wholesale price of around $287,000 annually per patient. Express Scripts Holding Co., the largest U.S. pharmacy benefits manager, says that price will overwhelm employer health plans.

"We're really hoping this product comes out at a much more affordable price, because the burden to payers is extraordinary," said Express Scripts Chief Medical Officer Steve Miller.

Vertex, based in Boston, Mass., already has a hit cystic-fibrosis drug in Kalydeco, which has a wholesale annual per-patient price of $311,000 in the U.S., and had $464 million in global sales last year. But Kalydeco treats a relatively rare type of cystic fibrosis, with a market of only 2,000 patients in the U.S. Orkambi, which combines Kalydeco with another compound, could be approved for 8,500 patients, or 28% of the 30,000 people in the U.S. with the disease.

Vertex is seeking approval to sell Orkambi to patients ages 12 and older with the most common genetic mutation causing cystic fibrosis, an inherited lung disease that kills many patients by their 20s. Zachry Barber, a Vertex spokesman, said in an email that Orkambi's effect in reducing patient hospitalizations and lung infections is "very meaningful to patients." If the drug is approved, it would be the only medicine to treat the underlying cause of the disease for eligible patients, he said.

"The treatment of cystic fibrosis represents a tiny fraction of overall spending on prescription medicines in the U.S.," Mr. Barber said.

He added: "Not being profitable all but one year out of 26 isn't sustainable, and our goal is to have a profitable company so we can continue to develop medicines for patients with cystic fibrosis."

The FDA isn't permitted to consider costs when evaluating whether to approve new drugs, but health insurers in recent years have become increasingly sensitive to high-priced treatments. In Arkansas, Medicaid officials in 2012 expressed concerns in emails about the potential costs of Orkambi to the state's pharmacy budget, The Wall Street Journal has reported. Prime Therapeutics LLC, a private pharmacy-benefits manager, has flagged Orkambi as one of several potential blockbusters that insurers and large employers should be prepared to pay for.

"The focus is going to shift to pricing, and the backlash that's going to result from the price that they charge," said Brian Skorney, an analyst with Robert W. Baird & Co.

The Week Ahead looks at coming corporate events.

Write to Joseph Walker at joseph.walker@wsj.com

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