GH1 and colorectal carcinoma: To study the functional effect of hGH on CRC progression, we stably transfected two CRC cell lines, DLD-1 and Caco2, with an expression vector containing the full length hGH cDNA (designated DLD-1-hGH and Caco2-hGH cells respectively) or an empty vector as control (designated DLD-1-vector and Caco2-vector cells respectively).