Peter Jennings' lung cancer, which he disclosed Tuesday on ABC World News Tonight, may be in an advanced stage, a local expert on the disease says. Most patients don't have their conditions diagnosed until the cancer is "so advanced that it can't be cured by surgery, and the patient has a poor chance of long-term survival," says Rita Axelrod of Thomas Jefferson University Hospital's Kimmel Center. Details of Jennings' condition haven't been disclosed, but his hoarse voice and the fact that he isn't having surgery immediately "suggests he could be in at least stage III" of lung cancer, says Axelrod,...