This is a first time in man (FTIM), Phase I study to determine the Maxiimum Tolerated Dose, Recommended Phase 2 Dose, safety, tolerability and Pharmacokinetics of AZD5312. This is a multicentre study with sites in the United States and United Kingdom. Approximately 90 patients are expected to be enrolled in this study.The study involves two parts, Part A, Dose Escalation and Part B, Dose Expansion.