JPMorgan Chase's (JPM) announcement that its top executive, Jamie Dimon, will undergo eight weeks of chemotherapy for throat cancer should make banks from Main Street to Wall Street ask themselves an important question: what would we do if our leader got sick?

It's a more frequent problem than many realize, as only the most high-profile cases get attention and many of those quickly fade from memory except among those who had to battle illness or its effects on business operations.

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