The present invention provides a method of preventing damage to non-neoplastic cells i.e. healthy cells by irradiating with a low-dose radiation to the non-neoplastic cells, wherein the low-dose radiation is used to initiate a protective cellular response which prevents later damage to non-neoplastic cells by cytotoxic chemical agents or chemo agents and initiating an immune response against neoplastic cells. The low-dose radiation is applied to the sensitive and the non- cancerous organs/cells at a given time before a high dose chemo/drug infusion session.
