(I'm going to assume this thread passes muster on the forum's no-religious-posts rule. No proselytizing here, just a historical account).
Yes, the Catholic Church has a couple of saints specifically designated for the needs of cancer patients.
One is St. Peregrine of Laziosi, a 13th-century cleric who according to tradition was himself miraculously cured of cancer, and then went on to become the patron saint of those suffering from cancer, AIDS, and other illnesses.
His story:
https://catholicsaints.info/saint-peregrine-laziosi/ and from the link:
"A victim of a spreading cancer in his foot, Peregrine was scheduled for an amputation. He spent the night before the operation in prayer; he received a vision of Christ who touched the diseased area. The next morning, Peregrine found his cancer completely healed. The other is St. Agatha who is the patron saint specifically for breast cancer patients.
Her story:
https://aleteia.org/2017/09/26/fighting-breast-cancer-here-is-a-patron-saint-for-you/Perhaps such saintly specialization is representative of the mindset of past centuries, when effective medical treatments for cancer were non-existent, and it was recognized that the only recourse for achieving a cure was to call for divine intervention, and the saints served that purpose.
It was the way to deal with cancer back then.
(Again, I'm hoping this thread doesn't engender some kind of debate resulting in eventual thread lockdown, but it just seemed like a rather interesting topic).