I am a cancer patient and I frequently get massages. Anything to make you feel better helps. My massage therapist has comped me a few massages, the last one shortly after my mom died and I had just had surgery and it was wonderful and kind.
Actually there is no restriction on massage on cancer patients, though that myth has been around. I asked my oncologist and he said it was perfectly fine and go for it. He is considering hiring a massage therapist for the chemo room at his practice. There are some minor precautions for certain breast cancer patients but we patients know who we are what they are and can tell you what our specific limitations are. I am getting acupuncture this week with the blessing of my doctor, with some limitations. If you have any concerns, have the client get an OK from her oncologist first. But I have known many cancer patients that have gotten massages while in treatment and none of us had any restrictions.
My hair stylist cut my hair short when it was about to come out due to chemo and she also helped me find a wig. I couldn't thank her enough.
The American Cancer Society has a program called Look Good Feel Better that teaches cancer patients how wear makeup, deal with hair loss, and other beauty issues. You could offer your services to ACS and become a Look Good Feel Better instructor. You could help a lot of people that way. It's a great program and many people (myself included) take advantage of it.
All these things matter a lot to those of us in treatment. Thank you for wanting to help your clients.