title: Variables in the demonstration of human tumor clonogenicity: cell interactions and semi-solid support.
mesh_terms: D002450:Cell Communication; D002455:Cell Division; D002478:Cells, Cultured; D002999:Clone Cells / Q000473:pathology*; D003470:Culture Media; D006801:Humans; D008214:Lymphocytes / Q000473:pathology; D008264:Macrophages / Q000473:pathology; D009369:Neoplasms / Q000473:pathology*
chemical_list: D003470:Culture Media