1) American Cancer Society: cancer is a complex group of diseases with many possible causes. 2) Cancer Research UK: there is no single cause for any one type of cancer. 3) Wikipedia: it is nearly impossible to prove what caused a cancer in any individual, because most cancers have multiple possible causes. 4) News-Medical.Net: cancers are a broad group of diseases and accordingly have a wide range of causes; each cancer is different according to its biology and pathophysiology; all animals and even plants are susceptible to cancers. 5) World Health Organization and its cancer research agency (IARC): cancer arises from one single cell; the transformation from a normal cell into a tumour cell is a multistage process, typically a progression from a pre-cancerous lesion to malignant tumours; these changes are the result of the interaction between a person's genetic factors and three categories of external agents, including physical carcinogens, chemical carcinogens and biological carcinogens. 6) Patient.co.uk: cancer is a disease of the cells in the body; each cancer is thought to first start from one abnormal cell; what seems to happen is that certain vital genes which control how cells divide and multiply are damaged or altered; many cancers seem to develop for no apparent reason. 7) German Cancer Research Center (Deutsches Krebsforschungszentrum, DKFZ): practically every organ can be affected, every type of cancer has its own rules, and the underlying changes in affected cells are extremely complex. Knowledge about the structure and functioning of DNA is necessary in order to decipher the causes of cancer. 8) National Cancer Institute: the genetic material (DNA) of a cell can become damaged or changed, producing mutations that affect normal cell growth and division; cancer is often perceived as a disease that strikes for no apparent reason; while scientists don't yet know all the reasons, many of the causes of cancer have already been identified; one way of identifying the various causes of cancer is by studying populations and behaviors. 9) NetDoctor.co.uk: cancer is the development of abnormal cells that the body cannot control; cancer affects nearly one in every three people in the population. 10) PubMed Health: there are many causes of cancer; however, the cause of many cancers remains unknown. OLD TESTAMENT (the first division of the Christian Bible): 1) magnetism (one of the phenomena by which objects exert attractive and repulsive forces on other objects) causes cancer; 2) depending on the configurations of electrons in their atoms, different substances exhibit differing types of magnetic behavior (diamagnetism, paramagnetism, ferromagnetism, ferrimagnetism, and antiferromagnetism); 3) intracellular molecules FeO;Fe2O3;Fe3O4 are the main 'creators' of intracellular superparamagnetic, ferrimagnetic and ferromagnetic nanoparticles; 4) cancer works (kills religious and non-religious cancer patients) by these nanoparticles; 5) ancient anti-iron methods of The Old Testament can quickly beat any cancer (a subtle iron disease; intracellular superpara-ferri-ferromagnetic 'infection'; the first-born of death) and religious beliefs of cancer patients-non-Christians.