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, OCTOBER 19 (9:00-10:01 p.m., ET) on the ABC Television Network.

�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 TBD.

�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.

A TV parental guideline will be posted closer to airdate.