Overall, the drug was "exceedingly well tolerated," Dr. Mosse said. "Most of the toxicities were extremely low-grade and did not affect overall quality of life. At the highest dose level that we tested, we saw irritation of the liver enzymes that were reversible."
The study was sponsored by the Children’s Oncology Group with collaboration from the National Cancer Institute. Dr. Mosse reported receiving research funding from Pfizer, which makes Xalkori.