Desperate prayer for my young son with rare cancer tumors

Please pray for salvation and healing and restoration for my son Thomas, he’s only 23 and was diagnosed with a rare GIST tumors that are resistant to most all treatments. He’s never been sick a day in his life and we were in total shock when we thought we were going to the ER for a gallbladder issue last year. His stomach had a large tumor and all over his liver. He’s lost almost 70 pounds and weak , he’s so uncomfortable since tumors are large and makes his middle area huge. Please pray for salvation and total healing either through doctors or miraculous instance by the gracious hand of the father. It’s almost to much to bear to watch your only child go through such pain and sickness and there’s nothing you can do to help or fix it , so I just keep trusting the one who can.