In the Original Investigation titled “Research and Development Spending to Bring a Single Cancer Drug to Market and Revenues After Approval,”1 published online September 11, 2017, there were 2 typographical errors in the Table. In row 1 of column 4, the date was changed from January 2002 to January 1992. In row 9 of the last column, 7689.1 was changed to the correct value of 6789.1. This article has been corrected online.