1. A method for treating leukemia, lymphoma, colon cancer, breast cancer, adenoid cystic carcinoma, brain cancer or a dysproliferative disease associated with a MYB dysregulation in a patient in need thereof, wherein the method comprises administering to said patient a therapeutically effective amount of a single chain peptide consisting of D-amino acids and comprising: an N-terminal portion comprising the amino acid sequence selected from KLENETSMLLLELEKIRK (SEQ ID NO:19) and KLENETSMLLLEL (SEQ ID NO:24); a C-terminal portion comprising the amino acid sequence RRRQRRKKRGY (SEQ ID NO:17); and the amino acid sequence therebetween selected from PADSSLDNLIKRYpSPRRSLIERR (SEQ ID NO:33), KRYpSPRRSLIERR (SEQ ID NO:23), and PADSSLDNLIKRYpS (SEQ ID NO:34).
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