The primary objective of this study is to evaluate the effect of the addition of idelalisib to rituximab on progression-free survival (PFS) in adults with previously treated indolent non-Hodgkin lymphoma (iNHL).

An increased rate of deaths and serious adverse events (SAEs) among participants with front-line chronic lymphocytic leukemia (CLL) and early-line iNHL treated with idelalisib in combination with standard therapies was observed by the independent data monitoring committee (DMC) during regular review of 3 Gilead Phase 3 studies. Gilead reviewed the unblinded data and terminated this study in agreement with the DMC recommendation and in consultation with the US Food and Drug Administration (FDA).

Key Inclusion Criteria:

• Histologically confirmed diagnosis of B-cell iNHL, with histological subtype limited to the following:

  1. Follicular lymphoma (FL) Grade 1, 2, or 3a
  2. Small lymphocytic lymphoma (SLL) with absolute lymphocyte count < 5 x 10^9/L at the time of diagnosis
  3. Lymphoplasmacytoid lymphoma/Waldenström macroglobulinemia (LPL/WM)
  4. Marginal zone lymphoma (MZL) (splenic, nodal, or extra-nodal)

Key Exclusion Criteria:

• History of lymphoid malignancy other than those allowed per inclusion criteria
• Ongoing drug-induced liver injury, active hepatitis C, active hepatitis B , alcoholic liver disease, non-alcoholic steatohepatitis, primary biliary cirrhosis, extrahepatic obstruction caused by cholelithiasis, cirrhosis of the liver, or portal hypertension.
• Received previous treatment with rituximab that was not effective.

Note: Other protocol defined Inclusion/Exclusion criteria may apply.

Qualified external researchers may request IPD for this study after study completion. For more information, please visit our website at http://www.gilead.com/research/disclosure-and-transparency.

18 months after study completion

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After conclusion of the study and without prior written approval from Gilead, investigators in this study may communicate, orally present, or publish in scientific journals or other media only after the following conditions have been met:

• The results of the study in their entirety have been publicly disclosed by or with the consent of Gilead in an abstract, manuscript, or presentation form; or
• The study has been completed at all study sites for at least 2 years