The stimulation of tumor cell growth by a substance produced by normal and tumor cells.
D000362:Agar; D000818:Animals; D002999:Clone Cells / Q000254:growth & development; D046508:Culture Techniques; D003956:Dialysis; D005246:Feedback; D006133:Growth Substances / Q000494:pharmacology*; D007942:Leukemia, Experimental; D007962:Leukocytes; D008264:Macrophages; D051379:Mice; D051381:Rats; D012513:Sarcoma, Experimental
D006133:Growth Substances; D000362:Agar