A Dose-escalation Study of MK-8776 (SCH 900776) With and Without Gemcitabine in Participants With Solid Tumors or Lymphoma (MK-8776-002/P05248)

Inclusion Criteria: * Must have a diagnosis of an advanced solid tumor malignancy or lymphoma (non-Hodgkin's or Hodgkin's lymphoma). * Must have histological or cytological evidence of malignancy. * Must have an advanced malignancy, metastatic or unresectable. For Part A of the study, the metastatic or unresectable malignancy should have recurred or progressed following standard therapy or failed standard therapy; or for which no standard therapy currently exists, or for which they are not candidates for standard therapy. For Parts B and C of the study, participants with advanced tumors for which gemcitabine is considered standard therapy (eg, pancreatic cancer), may be enrolled without having received prior gemcitabine. Standard therapy is defined as therapy that is approved in a particular line of therapy or considered as standard of care based on published peer reviewed data in a specific line of therapy. * Gemcitabine-naïve participants with tumors known to be responsive to gemcitabine or participants previously treated with gemcitabine who did not progress while on treatment or who are currently still responding to treatment should only be enrolled in cohorts for which gemcitabine doses are \>=1000 mg/m². Participants previously treated with gemcitabine, whose disease has progressed wile on treatment, can be enrolled to any part. * Must be ambulatory with an Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1. * Participants (and/or parent/guardian for participants who otherwise are unable to provide independent consent) must be willing to give written informed consent and able to adhere to dose and visit schedules. * Female participants of childbearing potential must have a negative pregnancy test within 7 days of first dose of protocol therapy. * Female participants of childbearing potential and male participants whose sexual partners are of childbearing potential must agree to abstain from sexual intercourse or to use an acceptable method of contraception during the study and for 90 days following the last dose of protocol therapy. Acceptable methods of contraception include condoms (male or female) with or without spermicidal agent, diaphragm or cervical cap with spermicide, medically prescribed intrauterine device (IUD), oral or injectable hormonal contraceptive, and surgical sterilization (eg, hysterectomy or tubal ligation). * Must have adequate bone marrow reserve as evidenced by a white blood cell (WBC) count \>=3,000/ μL, absolute neutrophil count (ANC) \>=1,500/μL AND platelet count \>=100,000/μL. * Must have adequate renal function as evidenced by a serum creatinine level \<=1.5 x upper limit of normal (ULN) or a calculated creatinine clearance \>60 mL/min. * Participants, except those with known Gilbert's Syndrome, must have adequate hepatic function as evidenced by a serum bilirubin level \<=1.5 x the ULN AND serum levels of aspartate and alanine aminotransferase (AST/ALT) levels \<=3 x the ULN for the reference lab (participants with known hepatic metastases must have serum AST/ALT levels \<=5 x the ULN for the reference lab). * Must be recovered from the effects of any prior surgery, radiotherapy or systemic antineoplastic therapy. Exclusion Criteria: * Has a known hypersensitivity to MK-8776 or gemcitabine or to any of their excipients or has received therapy with another Checkpoint kinase 1 (CHK1) inhibitor. * Has received any prohibited medication more recently than the indicated washout period prior to first dose of protocol therapy or must continue to receive prohibited medications. Prohibited medications: cytochrome P450 1A2 inhibitors, any chemotherapy, or investigational drugs. * Has significant underlying cardiac conduction system abnormalities such as bifascicular or greater block (eg, right bundle branch block with left anterior hemiblock or first degree atrioventricular block), fixed-rate pacemaker, or chronic atrial fibrillation with variable ventricular rate. * Has persistent, unresolved Common Terminology Criteria for Adverse Events (CTCAE) v 3.0 \>=Grade 2 drug-related toxicity (except alopecia, erectile impotence, hot flashes, and decreased libido) associated with previous treatment. * Has known human immunodeficiency virus (HIV), hepatitis B, hepatitis C, or a known history of liver cirrhosis or active alcohol abuse. * Is New York Heart Association (NYHA) Class III. * Has any other medical or psychiatric condition that, in the opinion of the investigator, might interfere with the subject's participation in the trial or interfere with the interpretation of trial results. * Has undergone major surgery within 3 weeks prior to first study drug administration after enrollment. * Has central nervous system (CNS) or leptomeningeal metastases. * Has received radiation therapy within 3 weeks prior to first study drug administration after enrollment or radiation therapy to \>25% of bone marrow. * Has received \>3 prior chemotherapy regimens (may have received prior gemcitabine). A participant may not have experienced any CTCAE v 3.0 \>Grade 1 myelotoxicity (neutropenia and/or thrombocytopenia) with any prior regimen, including gemcitabine. Participants with \>3 prior chemotherapy regimens, one or more of which were targeted, nonmyelosuppressive agents, may be considered on a case-by-case basis after discussion with the sponsor. * Has undergone previous allogeneic or autologous stem cell transplant. * Has had any of the following within 6 months prior to first study drug administration after enrollment: myocardial infarction, severe/unstable angina pectoris, coronary/peripheral artery bypass graft, symptomatic congestive heart failure, cerebrovascular accident or transient ischemic attack, or seizure disorder. * Has a known bleeding diathesis, eg, hemophilia. * Has a baseline QTc interval \>450 msec (ie, CTCAE v 3.0 Grade ≥2) at screening (within 21 days prior to 1st dose of MK-8776, mean of triplicate readings within approximately 5 minutes). * History of risk factors for Torsades de Pointes, including clinical history of heart failure, hypo- or hyperkalemia or hypomagnesemia (supplementation or other appropriate interventions to bring levels within normal institutional limits prior to administration of MK-8776 is acceptable), or family history of Long QT Syndrome. * Currently a smoker and/or is likely to smoke during the study. * Female participant who is breast-feeding, pregnant, or intends to become pregnant. * Participating in any other interventional clinical study. (Participants participating in another noninterventional study may be considered after discussion with the sponsor.) * Part of the staff personnel directly related to this study. * Family member of one of the investigational staff.