filamentous growth of a population of unicellular organisms in response to biotic stimulus +
negative regulation of response to biotic stimulus +
positive regulation of response to biotic stimulus +
regulation of response to biotic stimulus +
response to external biotic stimulus +
response to lectin +
response to tumor cell +
Any process that results in a change in state or activity of a cell or an organism (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of a stimulus from a tumor cell.