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GDC-0032

Phase 3

Breast Cancer, Non-small Lung Cancer | Small molecule | Oncology |Roche Holding AG|Trials Updated: Apr 9, 2026

GDC-0032 development status

Highest phase Phase 3 (NCT02340221)
Phase scored for RHHBYPhase 1
Registered trials 7 across 3 sponsors since Feb 2011

GDC-0032 target and mechanism

ModalitySmall molecule

Also known as GDC-0032 Tablet, Taselisib

Success Probability

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Market & Valuation

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Trial Design

CONTROLLEDBiomarker
Total Trials3
Total Enrollment482

FDA Designations

No designations recorded

GDC-0032 clinical trials

GDC-0032 · 3 trials · 4 indications

Phase 2 1Phase 1 2
NCT02273973A Study of Neoadjuvant Letrozole + Taselisib Versus Letrozole + Placebo in Post-Menopausal Women With Breast Cancer (LORELEI)Breast Cancer
COMPLETED334 Analytics
PHASE2COMPLETED
A Study of Neoadjuvant Letrozole + Taselisib Versus Letrozole + Placebo in Post-Menopausal Women With Breast Cancer (LORELEI)
Breast CancerUnlock trial analytics

Study Endpoints

Primary Endpoints

Percentage of Participants With Objective Response (OR) by Centrally Assessed Breast Magnetic Resonance Imaging (MRI) Via Modified Response Evaluation Criteria in Solid Tumors (mRECIST) Version 1.1
From Baseline to 16 weeks

Objective response rate (ORR) was defined as proportion of participants achieving complete response (CR) or partial response (PR). As per modified RECIST v1.1, CR: disappearance of all target lesions, PR: at least a 30% decrease in the sum of diameters of target lesions, taking as reference the baseline sum of diameters.

Percentage of Participants With Total Pathologic Complete Response (Total pCR), Defined as Having pCR in Both Breast and Axilla, Using American Joint Committee on Cancer (AJCC) Staging System
From Baseline to 16 weeks

Total pCR was assessed by local pathology review on samples taken at surgery following completion of neoadjuvant therapy. tpCR was defined as the absence of any residual invasive cancer on hematoxylin and eosin evaluation of the resected breast specimen and all sampled ipsilateral lymph nodes ( i.e., ypT0/Tis, ypN0 in the AJCC staging system, 7th edition).

Percentage of Participants With OR by Centrally Assessed Breast MRI Via mRECIST Version 1.1 in Phosphatidylinositol-4,5-Bisphosphate 3-Kinase, Catalytic Subunit Alpha (PIK3CA) Mutant (MT) Participants
From Baseline to 16 weeks

ORR was defined as proportion of participants achieving CR or PR. As per modified RECIST v1.1, CR: disappearance of all target lesions, PR: at least a 30% decrease in the sum of diameters of target lesions, taking as reference the baseline sum of diameters.

Percentage of Participants With Total pCR , Defined as Having pCR in Both Breast and Axilla, Using AJCC Staging System in PIK3CA MT Participants
From Baseline to 16 weeks

Total pCR was assessed by local pathology review on samples taken at surgery following completion of neoadjuvant therapy. tpCR was defined as the absence of any residual invasive cancer on hematoxylin and eosin evaluation of the resected breast specimen and all sampled ipsilateral lymph nodes (i.e., ypT0/Tis, ypN0 in the AJCC staging system, 7th edition).

Maximum Tolerated Dose (MTD) of Taselisib in combination with anti-HER2 therapy(ies) and/or paclitaxel.
28 Days
Safety: Incidence of adverse events
Approximately 3 years
Safety: Incidence of dose limiting toxicities
Up to 28 days

Secondary Endpoints

Percentage of Participants With OR by Centrally Assessed Breast MRI Via mRECIST Version 1.1 in PIK3CA Wildtype (WT) Participants
From Baseline to 16 weeks
Percentage of Participants With Total pCR Defined as Having pCR in Both Breast and Axilla, Using AJCC Staging System in PIK3CA WT Participants
From Baseline to 16 weeks
Percentage of Participants With OR by Breast Ultrasound Via mRECIST Version 1.1 in PIK3CA MT Participants
From Baseline to 16 weeks
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Study Design & Arms

AllocationRANDOMIZED
MaskingDOUBLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Letrozole + PlaceboPLACEBO_COMPARATORParticipants will receive 2.5 mg letrozole tablets orally QD along with placebo on a 5-days-on/2-days-off schedule for a total of 16 weeks.
Letrozole + TaselisibEXPERIMENTALParticipants will receive 2.5 milligrams (mg) letrozole tablets orally once daily (QD) along with taselisib tablets at 4 mg (two 2 mg tablets) orally on a 5 days-on/2 days-off schedule for a total of 16 weeks.
Arm AEXPERIMENTALArm A \- Taselisib with Trastuzumab emtansine (also called T-DM1) * Taselisib administered orally, daily in each treatment cycle (3 weeks). * Trastuzumab emtansine (also called T-DM1) administered once via IV per treatment cycle (3 weeks).
Arm BEXPERIMENTALArm B -Taselisib with T-DM1 and Pertuzumab * Taselisib is administered oral, daily or every other day per treatment cycle (3 weeks). * Trastuzumab emtansine (also called T-DM1) administered once via IV per treatment cycle (3 weeks). * Pertuzumab- administered once via IV per treatment cycle (3 weeks).
Arm CEXPERIMENTALArm C: * Taselisib with Pertuzumab and Trastuzumab * Cohort C will not open without additional authorization from Genentech * Taselisib is administered oral, daily in each treatment cycle (3 weeks). * Trastuzumab administered once via IV per treatment cycle (3 weeks). * Pertuzumab- administered once via IV per treatment cycle (3 weeks).
Arm DEXPERIMENTALArm D * Taselisib with Pertuzumab, Trastuzumab, and Paclitaxel * Cohort will not be opened without additional authorization from Genentech * Taselisib- administered oral, daily in each treatment cycle (3 weeks). * Pertuzumab- administered once via IV per treatment cycle (3 weeks). * Trastuzumab administered once via IV per treatment cycle (3 weeks). * Paclitaxel- administered via IV, weekly for 3 weeks within each cycle.
Arm A: GDC-0032 + DocetaxelEXPERIMENTALParticipants will receive GDC-0032 once daily for 21 consecutive days (beginning from Day 1) in each 21-day cycle along with Docetaxel on Day 1 of each 21-day cycle.
Arm B: GDC-0032 + PaclitaxelEXPERIMENTALParticipants will receive GDC-0032 once daily for 28 consecutive days (beginning from Day 1) in each 28-day cycle along with Paclitaxel on Days 1, 8, 15 and 22 of each 28-day cycle.
Arm C: GDC-0032 + DocetaxelEXPERIMENTALParticipants will receive GDC-0032 once daily on Day 1 and Days 8-14 of each 21-day cycle along with Docetaxel on Day 1 of each 21-day cycle.
Arm D: GDC-0032 + DocetaxelEXPERIMENTALParticipants will receive GDC-0032 once daily on Days 2-14 of each 21-day cycle along with Docetaxel on Day 1 of each 21-day cycle.
Arm E: GDC-0032 + DocetaxelEXPERIMENTALParticipants will receive GDC-0032 once daily on Days 1-14 of each 21-day cycle along with Docetaxel on Day 1 of each 21-day cycle.
Arm F: GDC-0032 + PaclitaxelEXPERIMENTALParticipants will receive GDC-0032 once daily on a 5-days on, 2-days off schedule in each 28-day cycle along with Paclitaxel on Days 1, 8, 5 and 22 of each 28-day cycle.
Arm G: GDC-0032 + PaclitaxelEXPERIMENTALParticipants will receive GDC-0032 once daily on a 3-days on, 4-days off schedule in each 28-day cycle along with Paclitaxel on Days 1, 8, 5 and 22 of each 28-day cycle.

Interventions

NameTypeDescription
LetrozoleDRUGLetrozole tablets will be administered orally at 2.5 mg QD for 16 weeks.
PlaceboOTHERPlacebo tablets matched to taselisib formulation will be administered orally daily on 5 days-on/2 days-off schedule for up to 16 weeks.
TaselisibDRUGTaselisib will be administered orally at 4 mg (two 2 mg tablets) daily.
Trastuzumab emtansineDRUG -
PertuzumabDRUG -
TrastuzumabDRUG -
PaclitaxelDRUG -
DocetaxelDRUGParticipants will receive docetaxel 75 milligrams per meter-squared (mg/m\^2) intravenous (IV) dose on Day 1 of each 21-day cycle.
GDC-0032DRUGParticipants will receive escalated dose of GDC-0032. The initial dose will be 3 mg capsules or 2 mg tablets.
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Eligibility Criteria

Age Range18 Years to N/A
SexFEMALE
Healthy VolunteersNo
Study Sites117

Inclusion Criteria: * Female participants * Postmenopausal status * Histologically confirmed invasive breast carcinoma, with all of the following characteristics: (i) Primary tumor greater than or equal to (\>/=) 2 centimeters (cm) in largest diameter (cT1-3) by MRI; (ii) Stage I to operable Stage ...

Countries:United StatesAustraliaAustriaBelgiumBrazilChileCzechiaEl SalvadorFranceGermanyGuatemalaHungaryItalyMexicoPanamaPeruPolandPortugalSouth KoreaSpainSwitzerlandUnited KingdomCanada
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Frequently asked questions about GDC-0032

What is GDC-0032?

GDC-0032 is an investigational small molecule oncology drug being developed by Roche Holding AG. It has been studied in a Phase 1 clinical trial in patients with HER2-negative locally recurrent or metastatic breast cancer or non-small cell lung cancer. It is not described as approved and remains in clinical development.

What is GDC-0032 used for in breast cancer and non-small cell lung cancer?

GDC-0032 has been studied for treatment in adults with HER2-negative locally recurrent or metastatic breast cancer or non-small cell lung cancer. The Phase 1 trial enrolled 80 patients across the United States, Belgium, Canada, and Spain. It is investigational and has not been established as an approved therapy for these cancers.

Who makes GDC-0032?

GDC-0032 is developed by Roche Holding AG, which trades under the ticker RHHBY. Roche sponsored the Phase 1 dose-escalation study of GDC-0032 given in combination with docetaxel or with paclitaxel in patients with HER2-negative locally recurrent or metastatic breast cancer or non-small cell lung cancer.

What phase is GDC-0032 in?

GDC-0032 is in Phase 1 development. Its single recorded trial, NCT01862081, was a Phase 1 dose-escalation study that has been completed. The study enrolled 80 patients and evaluated GDC-0032 in combination with docetaxel or with paclitaxel. GDC-0032 is investigational and not described as FDA approved.

What clinical trials is GDC-0032 in?

GDC-0032 has been evaluated in one clinical trial, NCT01862081, titled a dose-escalation study to assess the safety, tolerability, and pharmacokinetics of GDC-0032 in combination with docetaxel or with paclitaxel. That Phase 1 trial is completed and enrolled 80 patients with HER2-negative locally recurrent or metastatic breast cancer or non-small cell lung cancer.

Is GDC-0032 the same as GDC-0032 Tablet?

Yes, GDC-0032 Tablet is an alternative name for GDC-0032, the investigational small molecule developed by Roche Holding AG. Both names refer to the same agent studied in the completed Phase 1 trial NCT01862081 in HER2-negative locally recurrent or metastatic breast cancer or non-small cell lung cancer.