The third edition of the multi-network simulcast Stand Up To Cancer fundraising special is set to air live from LA’s Shrine Auditorium. ABC, CBS, Fox and NBC again are donating one hour of simultaneous commercial-free primetime space (8-9 PM ET/PT) for the show. HBO, HBO Latino, Bio, Lifetime Movie Network, Logo, MLB Network, mun2, Palladia and VH1 also have committed to the telecast so far, with more cablers expected to join in. All donations go to cancer research. Gwenyth Paltrow and Joel Gallen’s Tenth Planet Prods are executive producing the show, which like years past will include musical performances and celebrities manning phone banks. Laura Ziskin exec produced the first two telecasts in 2008 and 2010; she died of cancer in June 2011.