A Study Of PF-05280586 (Rituximab-Pfizer) Or MabThera® (Rituximab-EU) For The First-Line Treatment Of Patients With CD20-Positive, Low Tumor Burden, Follicular Lymphoma (REFLECTIONS B328-06)

Number of Participants With Grade 3 or Higher Treatment-Related Treatment-Emergent Adverse Events (AEs) as Graded by National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE) Version 4.03

Treatment-related AE was any untoward medical occurrence attributed to study drug in a participant who received study drug. Grade 1=Mild, asymptomatic or mild symptoms, Grade 2=Moderate; minimal, local or noninvasive intervention indicated; Grade 3 (Severe) events=unacceptable or intolerable events, significantly interrupting usual daily activity, require systemic drug therapy/other treatment. Grade 4 (Life-threatening) events caused participant to be in imminent danger of death. Grade 5 = death. Treatment-emergent were events after first dose of study drug that were absent before treatment or that worsened relative to pretreatment state.

Time frame: Baseline up to Week 52

Number of Participants With Clinically Significant Laboratory Abnormalities

Criteria for clinically significant laboratory abnormalities included total bilirubin (TB) less than (\<) 2\*upper limit of normal (ULN), alanine aminotransferase (ALT)\<3\*ULN; TB\<2\*ULN, ALT more than (\>) 3 equal to (=) \*ULN; TB\<2\*ULN, aspartate aminotransferase (AST)\<3\*ULN; TB\<2\*ULN, AST\>=3\*ULN. Data for only those categories are reported for which at least one participant had clinically significant laboratory abnormality.

Time frame: Baseline up to Week 52

Time to Treatment Failure (TTF)

TTF was defined as the time (in months) from date of randomization to first progression of disease based on central review, death due to any cause, or permanent discontinuation from treatment, or discontinuation from study for any reason, whichever came first. Progression was defined as any new lesion or increase by greater than or equal to (\>=) 50% of previously involved sites from nadir. TTF was calculated using Kaplan-Meier method.

Time frame: From randomization until disease progression, death or permanent discontinuation from treatment/study due to any reason, or up to Week 52

Progression-Free Survival (PFS)

PFS was defined as the time (in months) from date of randomization to first progression of disease (PD) based on central review or death due to any cause in the absence of documented PD. PD was defined as any new lesion or increase by \>=50% of previously involved sites from nadir. PFS was calculated using Kaplan-Meier method.

Time frame: From randomization until disease progression or death due to any cause or up to Week 52

Percentage of Participants With Complete Remission (CR) at Week 26

Complete Remission (CR) was defined as disappearance of all evidence of disease. CR was assessed by central review based on scans done at Week 26.

Time frame: Week 26

Duration of Response (DOR)

DOR was defined as the time (in months) from date of the first documentation of overall response (CR or PR) to the first documentation of progressive disease (PD) based on central review or to death due to any cause in the absence of documented PD. CR was defined as disappearance of all evidence of disease. PR was defined as regression of measureable disease and no new sites. PD was defined as any new lesion or increase by \>=50% of previously involved sites from nadir. DOR was calculated using Kaplan-Meier method.

Time frame: From date of first documentation of overall response to first documentation of PD or to death due to any cause in absence of PD or up to Week 52

Overall Survival

Overall survival was defined as the time (in months) from date of randomization to death due to any cause. For participants who were alive, overall survival was censored at the last contact. Overall survival was calculated using Kaplan-Meier method.

Time frame: From randomization until death due to any cause or up to Week 52

Maximum Observed Serum Concentration (Cmax) of PF-05280586 and Rituximab-EU

Time frame: Predose (within 4 hours prior to start of infusion) on Days 1, 8, 15 and 22; within 15 minutes prior to end of infusion on Days 1 and 22

Minimum Observed (Trough) Serum Concentration (Ctrough) of PF-05280586 and Rituximab-EU

Time frame: Predose (within 4 hours prior to the start of dosing) on Day 1, 8, 15, and 22

Cluster of Differentiation (CD) 19-Positive B-Cell Counts

Time frame: Baseline, Week 2, 3, 4, 5, 13, 26, 39, 52

Number of Participants With Positive Anti-Drug Antibodies (ADAs) and Neutralizing Antibodies (NAbs)

Human serum ADA samples were analyzed for the presence or absence of anti-rituximab antibodies or anti-PF-05280586 antibodies using the validated drug-specific assay with a tiered approach using screening, confirmation and titer/quantitation. Human NAb serum samples testing ADA positive were analyzed for the presence or absence of neutralizing anti-rituximab antibody and neutralizing anti-PF-05280586 antibody using the validated drug-specific assay with a tiered approach using screening, confirmation and titer/quantitation. Participants with their ADA titer \>= 1.88 were considered to be ADA positive. Only participants with a positive ADA result were further tested for NAb.

Time frame: Baseline up to Week 52

Number of Participants Reporting Immune-Based Adverse Effects

Immune-based adverse effects included infusion related reaction (IRR), adverse events which fulfill Sampson's criteria, and adverse events which belong to the Standardized Medical Dictionary for Regulatory Activities (MedDRA) Queries (SMQs) anaphylaxis or hypersensitivity reactions. Potential allergic and anaphylactic reactions were identified programmatically based on the criteria of Sampson et al, (2006).

Time frame: Baseline up to Week 52