Abstract: An agent for the prophylaxis and treatment of interstitial pneumonia and pulmonary fibrosis, which contains a compound having a Rho kinase inhibitory activity, particularly an agent for the prophylaxis and treatment of interstitial pneumonia and pulmonary fibrosis, which contains a compound of the formula (I) wherein each symbol is as defined in the specification, as the compound having a Rho kinase inhibitory activity, is provided.

Abstract: A purified proteinaceous substance bindable with p185, the translation product of the neu oncogene is disclosed. The purified proteinaceous substance may be characterized in that it increases the activity of the tyrosine kinase contained in the neu oncogene product but does not increase the activity of tyrosine kinase of epidermal growth factor receptor; induces p185 dimerization and internalization; affects the growth of cells which express p185 in a dose dependent manner; is heat stable from about 56.degree. C. to about 100.degree. C.; is degradable by protease; and has a molecular weight of from about 7,000 to about 14,000 daltons in its smallest active form as determined by gel filtration and ultrafiltration membrane analysis. Methods of detecting p185 on the surfaces of tumor cells are also disclosed.