The present invention is directed to the use of the peptide compound Gly-Trp-Thr-Leu-Asn-Ser-Ala-Gly-Tyr-Leu-Leu-Gly-Pro-D-Arg-Pro-Lys-Pro-Gln-Gln-D-Trp-Phe-D-Trp-Leu-Leu-NH2 as a therapeutic agent for the prophylaxis and/or treatment of cancer, autoimmune diseases, fibrotic diseases, inflammatory diseases, neurodegenerative diseases, infectious diseases, lung diseases, heart and vascular diseases and metabolic diseases. Moreover the present invention relates to pharmaceutical compositions preferably in form of a lyophilisate or liquid buffer solution or artificial mother milk formulation or mother milk substitute containing the peptide Gly-Trp-Thr-Leu-Asn-Ser-Ala-Gly-Tyr-Leu-Leu-Gly-Pro-D-Arg-Pro-Lys-Pro-Gln-Gln-D-Trp-Phe-D-Trp-Leu-Leu-NH2 optionally together with at least one pharmaceutically acceptable carrier, cryoprotectant, lyoprotectant, excipient and/or diluent.本発明は、癌、自己免疫疾患、線維性疾患、炎症性疾患、神経変性疾患、感染症、肺疾患、心臓および脈管の疾患ならびに代謝性疾患を予防および/または治療するための治療剤としての、Gly-Trp-Thr-Leu-Asn-Ser-Ala-Gly-Tyr-Leu-Leu-Gly-Pro-D-Arg-Pro-Lys-Pro-Gln-Gln-D-Trp-Phe-D-Trp-Leu-Leu-NH2のペプチド化合物の使用に関する。さらに、本発明は、Gly-Trp-Thr-Leu-Asn-Ser-Ala-Gly-Tyr-Leu-Leu-Gly-Pro-D-Arg-Pro-Lys-Pro-Gln-Gln-D-Trp-Phe-D-Trp-Leu-Leu-NH2のペプチドと、必要に応じて少なくとも1つの薬学的に受容可能なキャリア、少なくとも1つの凍結保護剤、少なくとも1つの分散保護剤、少なくとも1つの賦形剤および/または少なくとも1つの希釈剤とを含んでいる、好ましくは凍結乾燥物、緩衝液、人工母乳製剤、または母乳代替物の形態である薬学的組成物に関する。