ABC, CBS and NBC will air a simultaneous one-hour fundraiser for cancer research in prime-time on Sept. 5.
The "Stand Up to Cancer" broadcast will feature musical performances and celebrity appeals, although no guests were immediately announced Tuesday. The American Assn. for Cancer Research will distribute the money raised to specific organizations.
"We want everyone to know that they can make a difference in this fight," said Couric, whose husband and sister both died of cancer.