Pfizer said Monday it would pay $68.50 a share in cash for Global Blood Therapeutics, which has one of the few approved treatments for sickle-cell disease. The Wall Street Journal reported Friday that the companies were in advanced talks.

The acquisition continues a string of deals for Pfizer, which is flush with cash from sales of its Covid-19 vaccine and drug. It has said it wants to add $25 billion in revenue from business-development moves like mergers and acquisitions by 2030.

Adding Global Blood Therapeutics would bolster Pfizer's rare-diseases business and help it realize a longtime goal of selling drugs to treat sickle cell, an inherited blood disorder that affects about 100,000 people in the U.S. and 20 million worldwide, including many who are Black.

In patients with the disease, red blood cells look like crescents or sickles, rather than a normal disc shape. Due to their shape, the cells don't move easily and can block blood flow, damage organs and lead to strokes.

Researchers have been trying to develop effective treatments, including gene therapies, but the disease has proven hard to treat. A handful of drugs are approved, but most target the complications of sickle-cell disease, rather than its underlying cause. A bone-marrow transplant is the only cure.

New York-based Pfizer had tried to develop its own sickle-cell drug, but it failed.

In 2019, Global Blood Therapeutics won approval in the U.S. for a sickle-cell drug named Oxbryta. It has two other sickle-cell drugs in development.

"The deep market knowledge and scientific and clinical capabilities we have built over three decades in rare hematology will enable us to accelerate innovation for the sickle-cell disease community and bring these treatments to patients as quickly as possible," Pfizer Chief Executive Albert Bourla said.

Oxbryta produced $195 million in net sales last year for Global Blood Therapeutics, which is based in South San Francisco, Calif.

If each of the three Global Blood Therapeutics drugs is approved, the franchise has multibillion-dollar sales potential, especially if Pfizer can fold them into its global commercial network and market them worldwide, according to analysts.

"Pfizer will broaden and amplify our impact for patients and further propel much needed innovation," Global Blood Therapeutics Chief Executive Ted Love said.

The drugs could eventually face competition from gene therapies, however. Swiss drugmaker Novartis AG sells Adakveo, a treatment for pain crises in sickle-cell patients 16 years of age and older.

Pfizer's purchase, together with a recent agreement by Amgen Inc. to buy ChemoCentryx Inc., could help turn Wall Street sentiment on biotech shares. The former highfliers have slumped in recent months due to market turmoil, scientific setbacks and fear of antitrust scrutiny of combinations.