BAILEY TREATS A YOUNG MOTHER BATTLING BREAST CANCER, DEREK LEARNS MORE ABOUT MARK AND ADDISON�S RELATIONSHIP, AND THE INTERNS DEFEND A RESIDENT�S COMPTENCE AT A HOSPITAL STAFF MEETING, ON ABC�S �GREY�S ANATOMY�

�Grey�s Anatomy� Dedicates a Storyline to Breast Cancer Awareness, in Association with the Ford �Warriors in Pink� Campaign, Benefiting the Susan G. Komen Breast Cancer Foundation

Justina Machado (�Six Feet Under�) Guest Stars

�Oh, The Guilt� � Bailey treats a young mother battling breast cancer, Derek learns more about Mark and Addison�s relationship, the interns defend a resident�s competence at a hospital staff meeting, and Meredith and Addison examine a couple who find themselves in a rather awkward position, on �Grey�s Anatomy,� THURSDAY, DECEMBER 21 (9:00-10:01 p.m., ET) on the ABC Television Network. (Rebroadcast. OAD 10/19/06)

�Grey�s Anatomy� stars Ellen Pompeo as Meredith Grey, Patrick Dempsey as Derek Shepherd, Sandra Oh as Cristina Yang, Isaiah Washington as Preston Burke, Katherine Heigl as Isobel �Izzie� Stevens, Justin Chambers as Alex Karev, T.R. Knight as George O�Malley, Chandra Wilson as Miranda Bailey, James Pickens, Jr. as Richard Webber, Kate Walsh as Addison Shepherd, Sara Ramirez as Callie Torres and Eric Dane as Mark Sloan.

Guest Cast: Faith Prince as Sonja Kellman, Arye Gross as Adam Morris, Justina Machado as Diana Niles, Chris Conner as Jason Niles, Margo Harshman as Jennifer, Todd Babcock as Dr. Savoy, Moe Irvin as Nurse Tyler, Kate Anthony as Nurse Kate, Karl T. Wright as mediator, Libby Barnes as Dr. no. 1 and Tom Ormeny as Dr. no. 2.

�Oh, The Guilt� was written by Zoanne Clack, Tony Phelan, Joan Rater and directed by Jeff Melman.

�Grey�s Anatomy� is broadcast in 720 Progressive (720P), ABC�s selected HDTV format, with 5.1-channel surround sound and Spanish audio via SAP.

This program carries a TV-14,D,S parental guideline.