My wife refused Optune. She said it was too intrusive on her quality of life. She would need to shave her head every 2 days and were the arrays and backpack at least 18 hours a day.
The cost we were told was $21k a month and it would only extend life a few months. It might be a good solution for some but she wanted none of it.
Sorry to hear of your wife’s illness. I mentioned the Optune because this acquaintance is a long term survivor. No one knows whether the helmet made the difference. I had no idea of the cost. My acquaintance was an early user, so the cost to her was likely zero.