It was incurable and his life expectancy was estimated in months at that point. I'm not too sure if a "stage" was defined. His outlook largely depended on how further rounds of unpleasant chemo went - whereas Nanoknife, as far as I recall, was a single day out-patient thing (?)
I recall him telling me that he asked the staff how long it would be before they could start and they told him they were about half way through!
Quality of life: damage to the pancreas was not reversible, but the tumour was very much reduced and there was no further deterioration for a good while. For usnit was worth it (despite not being available on the NHS at that time).