Hello, I Am Looking For Best Treatment Or Clinical Trials

hello, i am looking for best treatment or clinical trials for the very rare cancer 'Carcinoma of maxillary sinus.
Checked multiple websites and government health websites here in Australia and the U.S, but all the technical terms stump me. i have send numerous emails, but was wondering if there is anything available for my sister-in-law in China or any web links directing me to clinical trials specifically for this cancer