The present invention provides
a peptide that selectively binds αvβ6
integrin, the
peptide having an
amino acid sequence comprising the motif X1BnRGDLX2X3X4ZmX5, wherein X1 is any D-
amino acid, Bn is a sequence of any n amino acids, which may be natural or unnatural, D- or L-, and may be the same or different, wherein n is a number between 1 and 10, X2 and X3 are independently selected from any
amino acid, X4 is Leu or Ile, Zm is a sequence of any m amino acids, which may be natural or unnatural, D- or L-, and may be the same or different, wherein m is a number between 1 and 10, X5 is any L- or D-amino acid. Also provided are conjugates comprising said
peptide, pharmaceutical compositions comprising said
peptide or said conjugates, and uses of said peptide, conjugate or composition, for example, in the treatment, imaging and / or diagnosis of an αvβ6-expressing tumour in a mammalian subject.