Safety Study of Rituximab (SC) Administered in Participants With CD20+ DLBCL or CD20+ Follicular NHL Grade 1 to 3A

An Open-Label, Multinational, Multicenter, Phase IIIB Study to Assess Safety of Rituximab Following Subcutaneous Administration in Patients With CD20+ DLBCL or CD20+ Follicular NHL Grade 1 to 3A

This open-label, single-arm study will evaluate the safety of rituximab subcutaneously (SC) administered during first line treatment for follicular non-Hodgkin's lymphoma (NHL) (Induction and/or Maintenance treatment plus 24 months of follow up), or diffuse large B-cell lymphoma (DLBCL) (treatment plus 24 months of follow-up).

Inclusion Criteria:

• Histologically confirmed, cluster of differentiation (CD)20+ DLBCL or CD20+ follicular NHL grade 1 to 3a, according to the world health organization (WHO) classification system
• Currently being treated with rituximab IV in the Induction or Maintenance setting, having received at least one full dose of rituximab IV, defined as standard full dose of rituximab IV 375 milligrams per square meter (mg/m^2) administered without interruption or early discontinuation because of tolerability issues
• Expectation and current ability for the participants to receive at least four additional cycles of treatment during the Induction phase or six additional cycles of treatment during the Maintenance phase (participants with follicular NHL)

Exclusion Criteria:

• Transformed lymphoma or FL IIIB
• History of other malignancy that could affect compliance with the protocol or interpretation of results. This includes a malignancy that has been treated but not with curative intent, unless the malignancy has been in remission without treatment for greater than or equal to (>/=) 5 years prior to dosing