A Phase I Study to Investigate the Safety, Tolerability and Pharmacokinetic Profile of of GSK2118436 in Japanese Subjects With BRAF Mutation Positive Solid Tumors

Inclusion Criteria: * Histologically or cytologically confirmed diagnosis of a solid tumor that is not responsive to standard therapies or for which there is no approved or curative therapy. * Subjects must have BRAF V600E or K mutant positive tumors. * Women with reproductive potential must be willing to practice acceptable methods of birth control during the study and for up to 4 weeks after the last dose of study medication. * Men with reproductive potential must be willing to practice acceptable methods of birth control during the study and for up to 16 weeks after the last dose of study medication. * Must have adequate organ function. * Must have Eastern Cooperative Oncology Group (ECOG) Performance Status of 0-1. Exclusion Criteria: * Currently receiving cancer therapy (chemotherapy, radiation therapy, immunotherapy, biologic therapy or surgery). * Use of an investigational anti-cancer drug within 28 days preceding the first dose of GSK2118436. * A history of other malignancy. Subjects who have been disease-free for 5 years or subjects with a history of complete resected non-melanoma skin cancer or successfully treated in situ carcinoma are eligible. * History of Human Immunodeficiency Virus (HIV) infection. * Certain cardiac abnormalities. * Pregnant or lactating female.