The present invention relates to a compound comprising a first polypeptide sequence comprising at least three different amino acid sequences selected from the group consisting of GFTFSDYW (SEQ ID NO: 1), IRLKSNNYAA (SEQ ID NO: 2) and TFGNSFAY (SEQ ID NO: 3), a second polypeptide sequence comprising at least three different amino acid sequences selected from the group consisting of TGAVTTNNY (SEQ ID NO: 4), GTN (SEQ ID NO: 5) and ALWYSNHWV (SEQ ID NO: 6), or a variant of any one of said amino acid sequences of SEQ ID NO: 1 to SEQ ID NO: 6 having a different amino acid at one position, wherein said compound or variant is capable of binding to tumour-associated Mucin-1 (TA-MUC1).