The present invention provides a circular dumbbell oligodeoxynucleotide (CDODN) comprising two loop structures and a stem structure, wherein the stem structure comprises a nucleotide sequence capable of binding the DNA-binding domain of a transcriptional factor. The present invention further provides a pharmaceutical composition comprising said CDODN. The pharmaceutical composition can be used for treating and/or preventing a disease or disorder related to such a transcriptional factor. The present invention also provides a method for treating and/or preventing a disease or disorder related to such a transcriptional factor, comprising administering to the subject a therapeutically effective amount of a CDODN comprising two loop structures and a stem structure, wherein the stem structure comprises a nucleotide sequence capable of binding the DNA-binding domain of the transcriptional factor.
