Efficacy and Safety of Idelalisib (GS-1101) in Combination With Rituximab for Previously Treated Indolent Non-Hodgkin Lymphomas (Yosemite)
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The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. |
ClinicalTrials.gov Identifier: NCT01732913 |
Recruitment Status :
Terminated
First Posted : November 26, 2012
Results First Posted : May 11, 2017
Last Update Posted : November 16, 2018
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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).
Condition or disease | Intervention/treatment | Phase |
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Indolent Non-Hodgkin's Lymphomas | Drug: Placebo Drug: Rituximab Drug: Idelalisib | Phase 3 |
Study Type : | Interventional (Clinical Trial) |
Actual Enrollment : | 295 participants |
Allocation: | Randomized |
Intervention Model: | Parallel Assignment |
Masking: | Triple (Participant, Care Provider, Investigator) |
Primary Purpose: | Treatment |
Official Title: | A Phase 3, Randomized, Double-Blind, Placebo-Controlled Study Evaluating the Efficacy and Safety of Idelalisib (GS-1101) in Combination With Rituximab for Previously Treated Indolent Non-Hodgkin Lymphomas |
Actual Study Start Date : | January 16, 2013 |
Actual Primary Completion Date : | May 18, 2016 |
Actual Study Completion Date : | May 18, 2016 |

Arm | Intervention/treatment |
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Experimental: Rituximab + idelalisib
Participants will receive rituximab + idelalisib.
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Drug: Rituximab
375 mg/m^2 administered intravenously weekly for 4 weeks, then every 8 weeks (up to a total of 8 infusions)
Other Names:
Drug: Idelalisib 150 mg tablets administered orally twice daily
Other Names:
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Placebo Comparator: Rituximab + Placebo
Participants will receive rituximab + placebo. Following confirmation of iNHL disease progression by the independent review committee and unblinding, participants may be eligible to receive open-label idelalisib 150 mg twice daily.
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Drug: Placebo
Tablets administered orally twice daily Drug: Rituximab 375 mg/m^2 administered intravenously weekly for 4 weeks, then every 8 weeks (up to a total of 8 infusions)
Other Names:
Drug: Idelalisib 150 mg tablets administered orally twice daily
Other Names:
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- Progression Free SurvivalProgression-free survival (PFS) is defined as the interval from randomization to the earlier of the first documentation of definitive indolent non-Hodgkin lymphoma (iNHL) disease progression or death from any cause. PFS was to be assessed by an independent review committee (IRC).
- Overall Response RateOverall Response Rate (ORR) is defined as the proportion of participants who achieve a complete response or partial response (or very good partial response or minor response for participants with Waldenstrom's). ORR was to be assessed by an IRC.
- Lymph Node Response RateLymph node response rate is defined as the proportion of participants who achieve ≥ 50% decrease from baseline in the sum of the products of the greatest perpendicular diameters of index lesions. Lymph node response rate was to be assessed by an IRC.
- Complete Response RateComplete response rate is defined as the proportion of participants who achieve a complete response. Complete response rate was to be assessed by an IRC.
- Overall SurvivalOverall survival is defined as the interval from randomization to death from any cause.

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Ages Eligible for Study: | 18 Years and older (Adult, Older Adult) |
Sexes Eligible for Study: | All |
Accepts Healthy Volunteers: | No |
Key Inclusion Criteria:
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Histologically confirmed diagnosis of B-cell iNHL, with histological subtype limited to the following:
- Follicular lymphoma (FL) Grade 1, 2, or 3a
- Small lymphocytic lymphoma (SLL) with absolute lymphocyte count < 5 x 10^9/L at the time of diagnosis
- Lymphoplasmacytoid lymphoma/Waldenström macroglobulinemia (LPL/WM)
- 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.

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT01732913

Study Director: | Gilead Study Director | Gilead Sciences |
Responsible Party: | Gilead Sciences |
ClinicalTrials.gov Identifier: | NCT01732913 |
Other Study ID Numbers: |
GS-US-313-0124 |
First Posted: | November 26, 2012 Key Record Dates |
Results First Posted: | May 11, 2017 |
Last Update Posted: | November 16, 2018 |
Last Verified: | March 2017 |
Individual Participant Data (IPD) Sharing Statement: | |
Plan to Share IPD: | Yes |
Plan Description: | 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. |
Supporting Materials: |
Study Protocol Statistical Analysis Plan (SAP) |
Time Frame: | 18 months after study completion |
Access Criteria: | A secured external environment with username, password, and RSA code. |
URL: | http://www.gilead.com/research/disclosure-and-transparency |
Studies a U.S. FDA-regulated Drug Product: | Yes |
Studies a U.S. FDA-regulated Device Product: | No |
iNHL indolent NHL follicular lymphoma CAL-101 Rituximab Small lymphocytic lymphoma lymphoplasmacytoid lymphoma Waldenstrom macroglobulinemia |
LPL WM Marginal zone lymphoma MZL SLL FL GS-1101 idelalisib |
Lymphoma Lymphoma, Non-Hodgkin Neoplasms by Histologic Type Neoplasms Lymphoproliferative Disorders Lymphatic Diseases Immunoproliferative Disorders Immune System Diseases Rituximab |
Idelalisib Antineoplastic Agents, Immunological Antineoplastic Agents Immunologic Factors Physiological Effects of Drugs Antirheumatic Agents Enzyme Inhibitors Molecular Mechanisms of Pharmacological Action |