Further evidence supporting a role for HMGA1 in prostate carcinogenesis includes the observation that high levels of HMGA1 in prostate cancer cells are related to enhanced proliferation and metastasis in vivo, studies suggesting that HMGA1 is involved in prostate cell chromosomal instability and rearrangements, and the fact that HMGA1 regulates transcription of a number of genes involved in various aspects of cell transformation and metastatic tumor progression. The gene discussed is HMGA1; the disease is metastatic neoplasm.