Pentapeptide having specific inhibiting effect on epidermal cell proliferation, the salts thereof, pharmaceutical compositions comprising the same and a process for the preparation of the pentapeptide and the pharmaceutical compositions

Epidermal cell proliferation inhibiting composition for inhibiting tumorous HelaS3 epidermal cells which comprises the novel pentapeptide of formula

• Xaa Glu Asp Ser Gly Seq. No. 1
• wherein Xaa is pyro-alpha-aminoadipic acid, or the pharmaceutically acceptable salt thereof together with one or more pharmaceutically acceptable inert carriers and/or diluents.

Process for the treatment of inhibiting tumorous HeLaS3 the epidermal cell proliferation of mammals which comprises administering to mammals, including humans an effective dose of

• Xaa Glu Asp Ser Gly seq. No.1
• wherein Xaa is pyro-alpha-aminoadipic acid, or the pharmaceutically acceptable salt thereof per se or in the form of a pharmaceutical composition.