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Friday’s multi-network “Stand Up 2 Cancer” telethon was viewed by an audience of 18.3 million, according to Nielsen.Michael-douglas-has-throat-cancer

That’s up 15% from the inaugural 2008 cancer special that raised $100 million. Hourlong program aired commercial-free on four broadcast nets and 11 cablers in a rare show of TV solidarity.

Among the celebrities answering phones on the Sony lot in Culver City, Calif., was Michael Douglas, who is currently battling throat cancer and stars in the upcoming sequel “Wall Street: Money Never Sleeps.”

In January, many networks collaborated with George Clooney, who hosted a telethon to benefit Haiti following the country’s devastating earthquake.