David Westin’s e-mail to ABC staffers this morning:

“This morning, Peter Jennings told his senior staff at World News Tonight that yesterday afternoon he was diagnosed with lung cancer. I include below the full text of Peter’s note to the group of people with whom he works most closely. He will begin outpatient treatment next week here in New York. It’s both Peter’s and my expectation that he will anchor World News Tonight during the period of treatment to the extent he can do so comfortably; but, we should also expect him to be off the broadcast from time to time, depending on how he feels. Charlie Gibson, Elizabeth Vargas, and others will be substituting for Peter as necessary and when their other responsibilities permit.”

“All of us at ABC News have watched over the years as Peter has led us on various assignments with strength and with courage. We’ve done our best to support him in these endeavors. Now, Peter’s been given a tough assignment. He’s already bringing to this new challenge the courage and strength we’ve seen so often in his reporting from the field and in anchoring ABC News. I know that all of us will give him every bit of support that he needs and asks for. Peter will once again lead the way, but we will stand with him at every turn.”