It was found that the growth of malignant tumour in mice was inhibited and the ability of immune cell’s dissolving cancer cells was enhanced hy ultralow frequency (ULF) pulsed gradient magnetic field. The DNA contents of nuclel decreased which indicated that magnetic field can block DNA replication and mitosis of cancer cells. It was observed that magnetic field inhibited the cancer cell’s metabolism, lowered its malig-nancy, and restrained its rapid and heteromorphic growth. The morphology properties of progammed Cell Death (PCD) of the cancer cells of the treated group hy magnetic field was observed for the first time. The heterockromatin condensed and coagulated together along the nuclear memhrane; the endoplasmic reticulums expanded and fused with the cellular membrane; many apoptotic bodies which were packed hy the cellular membrane appeared and were devoured hy the lymphocytes and plasma.
