DAR53...I am not an oncologist, but I assume that this patient has a metastatic cancer or some systemic cancer such as a lymphoma....To have a chance for a cure,he probably needs infusions with cancer killing meds, which would produce systemic inflammation, too severe to be managed by EPA alone....e.g. he would need high dose steroids.
EPA could be used as an adjunctive therapy to this treatment.
As an V centric geezer in AMRN terms with stellar results in terms of a handful (North 40K et al) adjunctive is the right term. V and/or EPA 500 since 2015, I still had a heart attack in 2020 and the wife's Parkinsons/Lewy body dementia is still progressing. V is a benefit, in this case maybe a pallitive, not a cure.