(Reuters) – Sanofi SA said on Friday its skin cancer drug, made in partnership with Regeneron Pharmaceuticals Inc, was approved by the U.S. Food and Drug Administration.

The drug, Libtayo, is used to treat a rare form of skin cancer, in patients whose condition has not improved following surgery or chemotherapy.

Metastatic cutaneous squamous cell carcinoma is the second-most common form of skin cancer, which accounts for an estimated 7,000 deaths in the United States each year, Sanofi said.

Libtayo, which boosts the immune system to fight cancer, will be sold in the United States at a list price of $9,100 for a three-week treatment cycle.

Cancer immunotherapy has become the fastest-growing segment of the $100 billion-a-year cancer drug market, with sales expected to top $25 billion by 2021, according to analyst forecasts compiled by Thomson Reuters.

Sanofi Genzyme, the company’s specialty care unit and Regeneron will market Libtayo jointly in the United States.

(Reporting by Aakash Jagadeesh Babu in Bengaluru; Editing by Shounak Dasgupta)

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