Hi Stephen
Just like @56tburd - I have never heard of any nor been aware of treatments for fibrosis.
I am from Toronto - treated with Stage IV nasopharyngeal carcinoma in 2006, and in mid 2020 I realised that I was not able to form words clearly - and that was when I was diagnosed with dysphagia and dysarthria and severe neck fibrosis.
My understanding was that nothing can be done to improve on the speech and swallowing of food or liquid - and that eventually I might have to end up with a feeding tube - for nutrition.
Currently I am taking physio therapy every other week, and also doing dysphagia exercises daily - hoping to stop my situation from deteriorating.
Is the treatment you are getting has connection to dysphagia and dysarthria?
Thanks!