Cassy's breath hitched in her throat. The words "not a match" echoed in her head and she staggered backward, feeling as though her entire life had been shattered. No, he had to be joking. There had to be a mistake somewhere. She took a step back, shaking her head in denial as she struggled to keep the tears from blurring her vision. "No," she rasped, her voice cracking. "That can't be right. I'm his mother! How can I not be a match?" The Doctor sighed and looked at the notepad on his hand again as though he would rather not be having this conversation. "I understand this is a lot to take in, Ms. Peyton. But unfortunately, there is a chance for a mother and child not to be compatible for a stem cell transplant." He explained Cassy pulled away from her mother's touch, a tremor running