Jennifer Matthews: Cheryl Hatton is living a parent's worst nightmare.

Cheryl Hatton: She used to tell me that she wished she died because it hurt too much, all the time.

Jennifer Matthews: Her 17-year-old daughter Rebecca has Osteosarcoma, a rare bone cancer that spread to her lungs and required aggressive chemotherapy.

Rebecca West: It's a little hard because I'm a girl and losing your hair is not fun, and being away from school and friends is a little hard.

Cheryl Hatton: It's like watching someone torture your child week after week.

Jennifer Matthews: But now Rebecca is trying a new type of chemo. It's inhaled instead of given through an IV. A tent is used, so the chemo doesn't get in the atmosphere.

Dr. Richard Gorlick: Inhalation chemotherapy is a means of targeting chemotherapy that it goes selectively to the lungs and has much lower concentrations in the blood stream.

Jennifer Matthews: More chemo reaches the cancer cells, but patients experience fewer side effects. So far, it's shrunk Rebecca's tumor.

Rebecca West: I get a little nauseous.

Jennifer Matthews: The drug being inhaled is Cisplatin. For the clinical trial, it's being inhaled and given through an IV.

Dr. Richard Gorlick: You couldn't use this as a replacement yet, but hopefully in the future.

Rebecca West: I try to be positive on it because you don't always want to be negative about it all the time and feeling sorry for yourself.

Jennifer Matthews: It's that attitude that keeps Rebecca's mom strong as she watches with hope. This is Jennifer Matthews reporting.