: The present invention provides
a DNA aptamer having a length of up to 80 nucleotides, preferably up to 40 nucleotides, and being or containing the sequence: GGGATACAGGGCTXTGTCTATGGTGTGGATGGCGGATACC (SEQ ID NO. 1), wherein X is T or A, and wherein one to three deoxynucleotides may optionally be modified by fluorination, and / or wherein one or more of deoxyguanosines G10, G22 and G31 may optionally be modified by replacing H2´ of the
sugar moiety with F, O-methyl, O-methoxyethyl, or by forming a covalent
methylene or
ethylene bridge between 2'-O and 4'-C, and / or wherein one or more of G10, G22 and G31 may optionally be modified by replacing the
hydrogen atom at the C8
carbon atom of the
guanine base with
bromine atom or with methyl, and / or wherein the phosphodiester linkage may optionally be replaced by phosphorothioate linkage in one or more nucleotides. The
DNA aptamers according to the invention are selective FGFR1 inhibitors and are useful in the treatment of skeletal disorders, developmental disorders, and cancers caused by aberrant FGFR1 signaling.