Haji Abdul Wahhaab saheb (Rahimahullah) (The head of the Raiwind Markaz in Pakistaan) advised the following Amal as a cure for cancer:
سبحان الله و بحمده سبحان الله العظيم
Recite the above 125 000 times. This can be read by a group of people as well and split over a few days.
He states that many people have found that the cancer of the patient disappeared after reading this amal and doctors were shocked.