Study of MK-8808 for Participants With Follicular Lymphoma (MK-8808-001)

• Number of Participants Experiencing Clinical and Laboratory Adverse Events (AEs) During MK-8808/CVP Combination Therapy [ Time Frame: From first dose of combination therapy up to 24 weeks ]
  An adverse event is any unfavorable and unintended change in the structure, function, or chemistry of the body whether or not considered related to the study treatment.
• Number of Participants Experiencing Clinical and Laboratory AEs During MK-8808 Maintenance Therapy [ Time Frame: From first dose of single agent MK-8808 up to 2 years ]
  An adverse event is any unfavorable and unintended change in the structure, function, or chemistry of the body whether or not considered related to the study treatment.

• Number of participants experiencing clinical and laboratory adverse events (AEs) during combination therapy [ Time Frame: From first dose (baseline) of CVP therapy up to 30 days post last dose (up to eight 21-day cycles of combination therapy) ]
• Number of participants experiencing clinical and laboratory AEs during single agent maintenance with MK-8808 [ Time Frame: From first dose (baseline) of single agent maintenance therapy up to 30 days after the last dose (up to 2 years) ]

• Maximum Concentration (Cmax) of Plasma Levels of MK-8808 When Used in Combination With CVP [ Time Frame: Pre-dose and end of infusion in each 21-day cycle and at end of therapy visit (up to 24 weeks) ]
  Cmax is a measure of the maximum concentration of the drug in the plasma as measured using plasma samples taken over specified time points.
• Cmax of Plasma Levels of MK-8808 During Single Agent Maintenance Therapy [ Time Frame: Predose and end of infusion in every other cycle and at end of therapy visit (up to 2 years) ]
  Cmax is a measure of the maximum amount of drug in the plasma over time using samples taken at specified time points.
• Lowest Concentration (Ctrough) of Plasma Levels of MK-8808 When Used in Combination With CVP [ Time Frame: Pre-dose and end of infusion in each 21-day cycle and at end of therapy visit (up to 24 weeks) ]
  Ctrough is a measure of the lowest level of drug in the plasma over time, using plasma samples collected at specified time points.
• Ctrough of Plasma Levels of MK-8808 When Used as Single Agent Maintenance [ Time Frame: Predose and end of infusion in every other cycle and at end of therapy visit (up to 2 years) ]
  Ctrough is a measure of the lowest level of drug in the plasma over time, using plasma samples collected at specified time points.
• Clinical Response of Tumor to MK-8808/CVP Combination Therapy [ Time Frame: Up to 2 years ]
  The response of the tumor to MK-8808/CVP combination therapy was radiographically assessed using Response Criteria Evaluation in Solid Tumors (RECIST). Response categories of partial response (PR), complete resonse (CR), and uncomfirmed (CRu) central review.

• Maximum concentration (C[max]) in plasma levels of MK-8808 when used in combination with CVP [ Time Frame: Day 1 of all CVP cycles (up to eight 21-day cycles) ]
• C[max] in plasma levels of MK-8808 when used as single agent maintenance [ Time Frame: Day 1 of every other bimonthly single agent maintenance therapy cycle; or Day 1 of each 6-month single agent maintenance cycle, up to 2 years ]
• Lowest concentration (C[trough]) of plasma levels of MK-8808 when used in combination with CVP [ Time Frame: Day 1 of all CVP cycles (up to eight 21-day cycles) ]
• C[trough] of plasma levels of MK-8808 when used as single agent maintenance [ Time Frame: Day 1 of every other bimonthly single agent maintenance therapy cycle; or Day 1 of each 6-month single agent maintenance cycle, up to 2 years ]
• Clinical response [ Time Frame: Before each cycle of CVP (baseline), every 3 to 4 months during maintenance therapy, and approximately one month after last dose of MK-8808, up to 2 years ]

• Drug: MK-8808
• Drug: cyclophosphamide
• Drug: vincristine
• Drug: prednisolone

Inclusion criteria:

• Histological diagnosis of CD20-positive follicular lymphoma, Grade 1, 2, or 3a (World Health Organization [WHO] 2008 classification) based on an excisional or incisional lymph node biopsy or a bone marrow biopsy.
• Ann Arbor Stage III or IV disease.
• Eastern Cooperative Oncology Group (ECOG) performance status of ≤2.
• Life expectancy >3 months with no expected need of immediate intervention to treat life-threatening complications.
• Adequate organ function.
• Participants must agree to use an adequate method of contraception starting with the first dose of study drug through 12 months (for females) or 90 days (for males) after the last dose of study drug.

Exclusion criteria:

• Histological Grade 3b or with >50% diffuse architectural pattern.
• Circulating malignant cells >25,000/mm^3
• Presence or history of central nervous system (CNS) disease (either CNS lymphoma or lymphomatous meningitis).
• Prior treatment with chemotherapy, rituximab, any other anti-CD20 compound, or any other type of anti-cancer compounds.
• Radiotherapy within 2 months prior to Cycle 1 Day 1.
• Current participation or has participated in a study with an investigational compound within 30 days prior to Cycle 1 Day 1.
• Concomitant disease that requires continuous therapy with prednisone at doses >20 mg per day.
• Any medical contraindication for prednisolone as being dosed in the CVP regimen.
• Poorly controlled diabetes mellitus, as defined by institutional or local standards.
• Grade >2 peripheral neuropathy.

• Has one of the following:

  1. is human immunodeficiency virus (HIV)-positive
  2. is Hepatitis B surface antigen positive (HBsAg+) or is positive for antibodies to Hepatitis B core antigen (anti-HBcAg+)
  3. has antibodies to Hepatitis C virus

• Has one or more of the following:

  1. Active tuberculosis based on institutional diagnostic criteria and local practice guidelines.
  2. Evidence of a tuberculosis infection based on a chest X-ray (CXR) or computed tomography (CT) scan performed within 3 months of dosing.
  3. History of a tuberculosis infection.
• Major surgical procedure within 4 weeks prior to Cycle 1 Day 1.
• Regular use (including "recreational" use) of any illicit drugs or recent history (within the last year) of drug or alcohol abuse or dependence.
• Pregnant or breastfeeding.