Topline Billionaires [Ken Griffin](https://www.forbes.com/profile/ken-griffin/?list=rtb/&sh=789219775079) and [David Geffen](https://www.forbes.com/profile/david-geffen/?list=rtb/&sh=14859af017e0) will donate $400 million to the Memorial Sloan Kettering Cancer Center, the organization announced Tuesday morning, the largest single gift ever given to the New York-based treatment and research institution. Key Facts Griffin and Geffen announced the donation Tuesday on “Good Morning America,” and Griffin said in a
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