I think the advice will vary hugely depending on the patient, the location of the cancer, the stage and various other things.
I have several cancer patients and will only perform treatments with the consent of their consultant or their specialist cancer nurse.
Many treatments will have huge benefits for most clients, but there will always be the exception.
My mum had throat cancer and any facial was a no-no for about a year. She can now have them but I'm not allowed to do any massage other than a light pressure point on her face, and this instruction is from her onchologist.
Her care team will be used to answering theswe types of questions, thats what they are there for, so get her to ask amd check that a facial would be ok.
This is very valid advice. It is not a case of one size fits all. Sometimes the benefits can outweigh the risk and this has to be a consideration. Especially in the case of terminal illness, there is a lot of research to support the benefits of massage therapies in improving quality of life. As a medical professional, I can make that decision and I understand perhaps this may be a difficult dilemma for non medical professionals. As has already been said, palliative care nurses offer this treatment to patients in their care, with great success. They certainly would not be doing anything to cause harm. Look holistically.