The present invention relates to substituted heterocyclic derivative compounds, compositions comprising said compounds, and the use of said compounds and compositions for epigenetic regulation by inhibition of bromodomain-mediated recognition of acetyl lysine regions of proteins, such as histones. Said compositions and methods are useful for the treatment of cancer and neoplastic disease.本發明係關於經取代之雜環衍生物化合物、包含該等化合物之組合物及該等化合物及組合物藉由抑制溴結構域介導的諸如組蛋白之蛋白質之乙醯基離胺酸區域識別而進行表觀遺傳調控的用途。該等組合物及方法適用於治療癌症及贅生性疾病。