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Roche agrees to buy Philadelphia biotech Spark Therapeutics for $4.3 billion, enriching CHOP, founders

The CHOP Foundation will collect at least $430 million for its Spark shares, plus other potential payments -- a huge return for the hospital’s $33 million investment since 2013.

Startup pharmaceutical company Spark Therapeutics offices in University City.
Startup pharmaceutical company Spark Therapeutics offices in University City.Read moreTOM GRALISH / Staff Photographer