cardiac sarcoma

Help. my 51 yo brother had a tumor removed from his heart in May. after further testing, other tumors were found in his body. after about 10 weeks, the tumor in his heart is back. he had trouble finding a dr who would treat him, but finally did. they were to start treatment today (aug 4) but he received a phone  call that he had to wait for insurance preauthorization. so he is still waiting, and the tumor is still growing. who can we talk to who can help us move this along? please, any information or leads would be so appreciated. if he doesn't get help soon, I hate to think about the consequences.