ACVR1B and lung cancer: In human lung cancer CL1-5 cells, ACVR1B (1.5-fold) and ID1 (inhibitor of DNA binding 1, dominant negative helix-loop-helix protein, 1.3-fold) were observed to be up-regulated, while LTBP3 (latent TGF-β binding protein 3, 1/1.6-fold) was down-regulated.