indirect cellular response to stimulus indirect cellular response to radiation Paul Schofield The most obvious example is the bystander effect ( Carmel Mothersill, Andrej Rusin, Cristian Fernandez-Palomo & Colin Seymour (2018) History of bystander effects research 1905-present; what is in a name?, International Journal of Radiation Biology, 94:8, 696-707, DOI: 10.1080/09553002.2017.1398436) where a naive cell behaves as if it has been irradiated because of its communication with an irradiated cell. It may also be used to describe the abscopal effect. Note that abscopal effects have been noted for ionising and non-ionising ( RF) radiation, eg. L?ffler MW. et al. . A Non-interventional Clinical Trial Assessing Immune Responses After Radiofrequency Ablation of Liver Metastases From Colorectal Cancer. Front Immunol. 2019 Nov 19;10:2526. doi: 10.3389/fimmu.2019.02526. PMID: 31803175; PMCID: PMC6877671 Any process that results in a change in state or activity of a cell (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of radiation acting on another cell and not on the responding cell. The process begins with detection of radiation by a cell or cells and ends with a change in state or activity of a different cell or cells.