Prime Minister Ariel Sharon has shown no sign of improvement after suffering a massive stroke a month ago. Doctors said there has been no sign that he is likely to regain consciousness. Though he is breathing by himself Hadassah Hospital still defines his condition as serious, but stable. "His age, his medical background and the dramatic nature of his stroke are not in the prime minister's favor," said Dr. Avraham Lazari, deputy director of the Re'ut rehabilitation hospital and an expert on rehabilitative medicine.