TFDP1 (Transcription Factor Dp-1) is a critical transcriptional regulator that functions primarily as a binding partner for E2F family transcription factors to control cell cycle progression and proliferation. TFDP1 forms complexes with E2F proteins, particularly E2F1 and E2F4, to bind DNA cooperatively through E2 recognition sites and regulate transcription of genes involved in cell cycle control and DNA replication 12. The protein plays essential roles in hematopoietic stem and progenitor cell proliferation, with deletion causing downregulation of cell cycle genes 2. TFDP1 also modulates global chr13 accessibility through transcriptional regulation of canonical histones 3. In cancer contexts, TFDP1 demonstrates oncogenic properties, with amplification at chromosome 13 occurring in 4.5% of breast cancers, particularly enriched in basal-like tumors (20%) 4. A recurrent frameshift indel mutation in TFDP1 has been identified in 70% of colorectal cancers, generating a gain-of-function protein that enhances cell proliferation, migration, and invasion 5. Additionally, TFDP1 transcriptionally activates oncogenes like KIF22 in endometrial cancer, promoting tumor aggressiveness and stemness 6. These findings establish TFDP1 as both a fundamental cell cycle regulator and potential therapeutic target in multiple cancer types.