Known dihydropyrimidine dehydrogenase (DPD) deficiency Patients with known dihydropyrimidine dehydrogenase (DPD) deficiency will be excluded Known DPD (dihydro pyrimidine dehydrogenase) deficiency Patients with history of positive dihydropyrimidine dehydrogenase (DPD) deficiency Patient with known dihydropyrimidine dehydrogenase (DPD) deficiency Known dihydropyrimidine dehydrogenase (DPD) deficiency or history of severe and unexpected reactions to fluoropyrimidine therapy in patients selected to receive capecitabine Patients with a known dihydropyrimidine dehydrogenase (DPD) deficiency are ineligible Known dihydropyrimidine dehydrogenase (DPD) deficiency No known history of dihydropyrimidine dehydrogenase deficiency Known dihydropyrimidine dehydrogenase deficiency Known allergy to fluoropyrimidines or known dihydropyrimidine dehydrogenase (DPD) deficiency. Known dihydropyrimidine dehydrogenase (DPD) deficiency Subject has known dihydropyrimidine dehydrogenase deficiency. Patients with known dihydropyrimidine dehydrogenase deficiency Known dihydropyrimidine dehydrogenase deficiency Has known dihydropyrimidine dehydrogenase deficiency (DPD) deficiency (testing not required) Known homozygous DPD (dihydro pyrimidine dehydrogenase) deficiency Patients with known dihydropyrimidine dehydrogenase (DPD) deficiency Contraindications or history of allergic reaction to lapatinib or to capecitabine, known dihydropyrimidine dehydrogenase deficiency, or known hypersensitivity of 5-fluorouracil Known dihydropyrimidine dehydrogenase (DPD) deficiency Known dihydropyrimidine dehydrogenase (DPD) deficiency Has a known DPD deficiency Known hypersensitivity to 5-fluorouracil or known dihydropyrimidine dehydrogenase (DPD) deficiency Known dihydropyrimidine dehydrogenase (DPD) deficiency Has known dihydropyrimidine dehydrogenase deficiency (DPD) deficiency (testing not required) Known dihydropyrimidine dehydrogenase (DPD) deficiency or severe renal impairment (creatinine clearance < 30 mL/min by Cockcroft-Gault formula) Known dihydropyrimidine dehydrogenase (DPD) deficiency Known dihydropyrimidine dehydrogenase (DPD) deficiency Known dihydropyrimidine dehydrogenase (DPD) deficiency Known dihydropyrimidine dehydrogenase deficiency Patients with known deficiency of the dihydropyrimidine dehydrogenase (DPD) enzyme Prior systemic fluoropyrimidine therapy; prior topical fluoropyrimidine use is allowed; prior unanticipated severe reaction to fluoropyrimidine therapy, or known hypersensitivity to 5-fluorouracil or known dihydropyrimidine dehydrogenase deficiency (DPD) deficiency Known hypersensitivity to capecitabine, temozolomide, or any component of the formulation and or a known deficiency of dihydropyrimidine dehydrogenase Prior systemic fluoropyrimidine therapy (unless given in an adjuvant setting and completed at least 6 months earlier); prior topical fluoropyrimidine use is allowed; prior unanticipated severe reaction to fluoropyrimidine therapy, or known hypersensitivity to 5-fluorouracil or known dihydropyrimidine dehydrogenase (DPD) deficiency Known dihydropyrimidine dehydrogenase (DPD) deficiency Known dihydropyrimidine dehydrogenase (DPD) deficiency Prior severe reaction to fluoropyrimidines, known dihydropyrimidine dehydrogenase deficiency (DPD), or other known hypersensitivity to active substances, including fluorouracil (5-FU), or ruxolitinib, or any of their excipients. No prior history of:\r\n* Congestive heart failure (New York Heart Association [NYHA] class I to IV)\r\n* Known dihydropyrimidine dehydrogenase (DPD) deficiency Prior severe reaction to fluoropyrimidines, known dihydropyrimidine dehydrogenase deficiency (DPD), or other known hypersensitivity to active substances, including fluorouracil (5-FU), ruxolitinib, or any of their excipients. Known deficiency of dihydropyrimidine dehydrogenase (DPD) Known dihydropyrimidine dehydrogenase deficiency or thymidylate synthase gene polymorphism predisposing the patient for 5-FU toxicity Patient must not have known dihydropyrimidine dehydrogenase (DPD) deficiency or severe renal impairment (creatinine clearance below 30 mL/min by Cockcroft and Gault formula) as this would prelude use of capecitabine Has a known dihydropyrimidine dehydrogenase deficiency Known DPD deficiency; Known dihydropyrimidine dehydrogenase deficiency Patients with dihydropyrimidine dehydrogenase (DPD) deficiency Known dihydropyrimidine dehydrogenase (DPD) deficiency. Testing for DPD deficiency must be performed where required by local regulations, using a validated method that is approved by local health authorities.