A Study of Selumetinib in Chinese Paediatric and Adult Subjects With Neurofibromatosis Type 1 (NF1) and Inoperable Plexiform Neurofibromas (PN)

"All eligible subjects will first receive a single oral dose of selumetinib 25 mg/m\^2. After a washout period of 2 days, oral selumetinib 25 mg/m\^2 twice daily will be administered continuously. Subjects will continue to receive selumetinib until disease progression or unacceptable drug-related toxicity, whichever occurs first.~10 mg and 25 mg capsules strengths available."