Yes it is. Sorry to hear about your sister-in-law, perhaps she would be better served by not accepting the 'terminal' label, we are all terminal in some way.
Here are some links I found including a 3 year old thread where newport points out the importance of limiting salt to reduce swelling //www.curezone.org/forums/fm.asp?i=862106#i
Also this on I-131 "RATIONALE: Radiolabeled monoclonal antibodies, such as Iodine I 131 monoclonal antibody 3F8, can find tumor cells and carry tumor-killing substances to them without harming normal cells. This may be an effective treatment for central nervous system cancer or leptomeningeal metastases. PURPOSE: This phase II trial is studying the side effects and how well Iodine I 131 monoclonal antibody 3F8 works." http://clinicaltrialsfeeds.org/clinical-trials/show/NCT00445965.