If you want a method that has proven effective at shrinking tumors then I think the use of direct current should be considered. It at least has medical research behind it, unlike some other approaches. Below is a summary of the clinical investigations of DC current against cancer tumors. If you want more info on this approach then message me.
Initial research paper printed in Science magazine #130, 1959
Biophysical Approach Toward Tumor Regression In Mice.
Mice were given implants of sarcoma-180 tumors. Two external electrodes were placed on the skin, one over the tumor area. 3mA of direct current was applied for 4.8 hours daily, alternating hours between treatment and non-treatment so that total time was almost 9 hours. After 15 days the treated tumors were 58% smaller than the tumors in the control group. "By the 21st day all control animals had died and a 60 percent total regression of the test tumors had occurred. (Total regression means that the tumor had decreased progressively in volume, hardened, and dropped off, leaving a new skin surface at the former tumor site.)"
Medical Hypotheses (1997) 49, pg 297-300
Targeting a key enzyme in cell growth: A novel therapy for cancer.
This study hypothesizes that the successes of studies of direct electrical current (DC) against cancer tumors is due to the fact that DC inhibits the RR enzyme which is necessary for cancer cell growth. The paper reviews other studies that had, amongst others, these results; 1) 60% of the treated mice had their tumors decrease/harden/drop-off using external electrodes at 3mA current for 4.8 hours daily for 21 days, 2) 88% tumor destruction in hamsters using one external electrode and one implanted needle electrode at 3mA for 1 hour daily for 4 days, 3) 98% average reduction in tumor size in hamsters using one external electrode and one implanted needle electrode at 2.4mA for 1 hour daily for 5 days.
Alternative Cancer Treatment with few side effects: The Electro Carcinoma Therapy (ECT).
This is information from the German clinic which references a 30% success rate (of total tumor destruction) that the Chinese had with over 10,000 patients. An additional 40% had reduction of tumor size. They applied the DC current to platinum wire electrodes, in the form of needles, injected directly into the tumors. In contrast; the German Marburg Institute works almost exclusively with metal electrode plates applied to the skin which gives them the same results. Their treatments are for 2-3 hours for at least 2 consecutive days. They vary the current amount according to tumor size and density.