By Jonathan D. Rockoff and Tess Stynes 

Bristol-Myers Squibb Co. said Thursday its second-quarter revenue rose 7% thanks to a boost from sales of its new Opdivo cancer drug, results indicating the company's big bet on such immunotherapies is paying off.

For years, researchers struggled to figure out how to enlist the body's own immune defenses in the fight against cancer, and many companies shied away from the field due to the risks. Now, immunotherapy sales are helping propel sales growth at Bristol, while rivals including Merck & Co. and Roche Holding AG are joining the fray.

Cancer immunotherapy is expected to be one of the pharmaceutical industry's biggest growth drivers, with analysts at Goldman Sachs estimating drug sales will reach $25 billion by 2025. Bristol's Yervoy was the first immunotherapy approved, in 2011.

Opdivo, approved for sale by the U.S. Food and Drug Administration last December for skin cancer and then in March for lung cancer, contributed sales of $122 million in its second quarter on the market, up sharply from $40 million in the first quarter. Analysts expect Opdivo will amass billions of dollars in yearly sales, as its launch progresses and use broadens in lung and potentially other cancers.

"We really are entering a period of exciting growth," Bristol CEO Giovanni Caforio said on an earnings call - his first since taking Bristol's helm in May.

In the second quarter, revenue at New York-based Bristol increased to $4.2 billion from $3.9 billion a year earlier. Excluding currency effects, the growth was 16%.

Overall, Bristol-Myers reported a loss of $130 million, or eight cents a share, compared with a year-earlier profit of $333 million, or 20 cents a share.

The latest period included a charge of 48 cents a share related to Bristol's purchase in April of certain immunotherapy drugs under development by Flexus Biosciences. Excluding such one-time items, per-share earnings rose to 53 cents from 48 cents.

The earnings report comes two days after Bristol said it was stopping early a late-stage trial of Opdivo because the drug provided superior overall survival in kidney cancer patients, compared to a rival cancer drug. In another recent study, a combination of Opdivo and Yervoy delayed the progression of melanoma longer than either drug alone, results that could support wider use of both drugs.

In the quarter, Bristol also saw sales gains for the Eliquis anticlotting drug it sells with Pfizer and for its hepatitis C franchise. The $479 million in hepatitis C sales was boosted by recognition of $170 million previously deferred revenue in France related to an early access program.

But that was a one-time bump, and Chief Financial Officer Charles Bancroft said franchise sales are expected to be pressured in Japan. Bristol had once targeted hepatitis C as a major growth driver, but was outflanked by rivals including Gilead Sciences Inc. Mr. Caforio said Bristol no longer plans to seek FDA approval for its all-oral hepatitis C regimen.

In the quarter, sales of older drugs like Abilify and Erbitux fell. And Opdivo's growth in skin cancer in the U.S. cut into Yervoy sales, which fell 8% from a year earlier to $296 million.

Also, Bristol said it had ended two phase 3 trials studying Yervoy in severe forms of prostate cancer and lung cancer, after the drug failed to prolong the lives of those patients. "We know not everything we study will be successful," Mr. Caforio said.

As a result of the better-than-expected revenue growth in the quarter, Bristol raised its per-share earnings estimate by a dime and now expects $1.70 to $1.80.

Write to Jonathan D. Rockoff at Jonathan.Rockoff@wsj.com and Tess Stynes at tess.stynes@wsj.com

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