By Josh Beckerman 
 

Merck & Co. has increased its stock-buyback authorization by $10 billion, a move the company said "reiterates our confidence in the company's long-term business strategy and future prospects."

Merck's repurchase authorization now stands at $11.7 billion, including about $1.7 billion remaining under a program announced in May 2013.

There is no designated time frame for the planned buybacks.

In February, Merck reported that fourth-quarter sales fell 7.4% to $10.48 billion, with foreign-exchange accounting for three percentage points of the drop. Sales of the anti-inflammatory drug Remicade, which Merck markets in certain countries outside the U.S., declined 10% due to competition from biosimilar versions in Europe.

In after-hours trading, Merck shares were up 1.5% to $59.49.

Earlier Tuesday, Merck said it halted a study of its new cancer immunotherapy Keytruda after positive clinical-trial news. The company found the drug prolonged survival versus Bristol-Myers Squibb's Yervoy in first-line treatment of patients with the skin cancer melanoma.

Write to Josh Beckerman at josh.beckerman@wsj.com

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