We tried zeolite after surgery for stage 4 cancer. It definitely cleared out the chemo drugs and other toxins, but did not stop the cancer from coming back. The PET 6 months after the surgery showed the beginning of a new metastasis in the lung, and at 9 months it had grown and was resected. Two months later it was in both lungs. We did two of three planned rounds of chemo, and use tongren therapy regularly. The cancer was gone after round 1, still gone after round 2. He has been out of chemo since June and has been cancer free since April or May. After my husband's surgery, he always had cold extremities. After his first tongren class, his hands were warm again so I knew something changed. They stayed that way till his next lung resection a month later. After he recuperated from the second surgery, we began attending tongren guinea pig class regularly. It cannot possibly hurt, and I have seen amazing results with cancer patients, which is only one of the many things we treat. For those who cannot make it to a class, it is also available by phone as a conference call with amazing results. There are conference groups for all disease, as well as a group which is cancer specific for those who are Stage 4. We really have nothing to lose by trying it, besides our ill health. My husband's oncologist has been amazed at the kind of progress he has made, and I keep reminding her I tap the doll daily. They have begun a study of it in the Psychology department at Harvard Medical School in conjunction with Dana-Farber, so it offers promise if they are willing to look at it.