AZD-5363, a novel pyrrolopyrimidine-derived compound, inhibits all AKT isoforms with a potency of <10nM, and inhibited phosphorylation of AKT substrates in cells with a potency of ~0.3 to 0.8µM. AZD5363 monotherapy inhibited the proliferation of 41/182 solid and hematologic tumour cell lines with a potency of <3µM and 25/182 with a potency of <1µM. By targeting AKT, the key node in the PIK3/AKT signaling network, AZD-5363 may be used as monotherapy or combination therapy for a variety of human cancers. There is significant relationship between the presence of PIK3CA and/or PTEN mutations and sensitivity to AZD-5363, and between RAS mutations and resistance. In xenograft studies in vivo AZD-5363 significantly reduced phosphorylation of PRAS40, GSK3β and S6. Chronic oral dosing of AZD-5363 causes dose-dependent inhibition of the growth of xenografts derived from various tumor types and AZD-5363 also significantly enhanced the antitumor activity of docetaxel, lapatinib and trastuzumab in breast cancer xenografts. Dose-response at oral doses of 50 to 150mg/kg twice daily continuous dosing and intermittent dosing in the range of 100 to 200mg/kg twice daily, 4 days on, 3 days off have led to efficacy. AZD-5363 is in phase II clinical studies for the treatment of breast cancer; gastric cancer; non-small cell lung cancer.