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Metastatic Breast CancerPhase 1NCT02390427

Phase Ib Dose-escalation Trial of Taselisib (GDC-0032) in Combination With Anti-HER2 Therapies in Participants With Advanced HER2+ Breast Cancer

A Phase 1 study testing Taselisib, Trastuzumab emtansine and Pertuzumab in people with Metastatic Breast Cancer and Recurrent Breast Cancer, run by Nancy Lin, MD at 3 sites in United States.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
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Trial summary

This research study is a way of gaining new knowledge about the combination of Taselisib with other drugs in the treatment of metastatic breast cancer. Taselisib is an investigational drug which works by blocking a protein called PI3K (phosphoinositide 3-kinase) that helps cancer cells grow. Read more about this study

Who is it for?
Ages 18 years and older
What is being tested?
Taselisib, Trastuzumab emtansine and Pertuzumab
Could I receive a placebo?
No, everyone receives an active treatment
How many people
68 participants
Where
3 sitesUnited States
Study dates
20 Apr 2015to Jul 2024
Phase
Phase 1
Are there results?
None posted in the registry

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 years and older
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Metastatic, locally advanced , or locally recurrent breast cancer
  • Histologically confirmed HER2+ invasive breast cancer
  • Measurable or non-measurable disease per RECIST v1.1
  • Prior therapy - Prior trastuzumab, lapatinib, pertuzumab, and trastuzumab emtansine (T-DM1) are allowed. Patients who have received prior therapy with Taselisib (GDC-0032) or BYL-719 are excluded. There is no limit on the number of prior lines of therapy.
  • ECOG performance status 0 or 1
  • Normal organ and marrow function as defined below:
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  • Absolute neutrophil count ≥ 1,500/mm3
  • Platelets ≥100,000/mm3
  • Total bilirubin < 1.5 X institutional upper limit of normal. For patients with Gilbert syndrome, the direct bilirubin should be within the institutional normal range
  • AST (SGOT) and ALT (SGPT) < 2.5 X institutional upper limit of normal
  • Serum creatinine ≤ 1.5 x ULN or creatinine clearance ≥ 50 mL/min
  • Fasting glucose ≤ 120 mg/dL and HbA1c < 7%
  • Left ventricular ejection fraction ≥ 50%
  • Women of childbearing potential (including those who have had a tubal ligation) must have a documented negative pregnancy test within 14 days prior to planned initiation of Taselisib.
  • Ability to understand and the willingness to sign a written informed consent document.
  • For Part 2: patients must have tissue that is amenable to biopsy and must be willing to undergo research biopsy. Patients who undergo an attempted research biopsy procedure for the purpose of this protocol, and in whom inadequate tissue is obtained, are not required to undergo a repeat biopsy in order to continue on protocol.

Who cannot join

  • Anti-cancer therapy within 2 weeks prior to entering the study or those who have not recovered from acute adverse events due to agents administered more than 2 weeks earlier. Palliative radiation to bony metastases ≥2 weeks prior to study entry is allowed.
  • Prior treatment with a PI3 kinase, AKT or mTOR inhibitor in which the patient experienced a Grade ≥3 drug related adverse event or otherwise would be at increased risk for additional PI3K related toxicity
  • Currently receiving any other investigational agents. Treatment with an investigational agent within 2 weeks prior to planned initiation of study therapy is allowed provided that any drug related toxicity has completely resolved
  • Major surgical procedure within 4 weeks prior to planned initiation of study therapy
  • Significant traumatic injury within 3 weeks prior to planned initiation of study therapy
  • Known untreated brain metastases are excluded. History of treated CNS metastases is okay, provided the following criteria are met:
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  • Disease outside the CNS is present.
  • No evidence of interim progression between the completion of CNS directed therapy and the screening radiographic study
  • No history of intracranial hemorrhage or spinal cord hemorrhage
  • Not requiring anti-convulsants for symptomatic control
  • Minimum of 3 weeks between completion of CNS radiotherapy and Cycle 1 Day 1 and recovery from significant (Grade ≥ 3) acute toxicity with no ongoing requirement for corticosteroid
  • History of allergic reactions or hypersensitivity attributed to compounds of similar chemical or biologic composition to the Taselisib drug formulation or other agents used in this study.
  • Receiving any medications or substances that are inhibitors of CYP3A4.
  • Malabsorption syndrome or other condition that would interfere with enteral absorption
  • Active small or large intestine inflammation such as Crohn's disease or ulcerative colitis
  • Type 1 or 2 diabetes requiring anti hyperglycemic medication (e.g. metformin, glipizide, insulin)
  • Leptomeningeal disease as the only manifestation of the current malignancy
  • Congenital long QT syndrome or QTc > 500 msec
  • Active congestive heart failure or ventricular arrhythmia requiring medication
  • Uncontrolled ascites requiring weekly large volume paracentesis for 2 consecutive weeks prior to initiation of study treatment
  • Active infection requiring intravenous (IV) antibiotics
  • Patients requiring any daily supplemental oxygen
  • Uncontrolled hypomagnesemia, hypokalemia or hypocalcemia, defined as values below the lower limit of normal (LLN) for the institution despite adequate electrolyte supplementation or management
  • Symptomatic hypercalcemia requiring continued use of bisphosphonate or denosumab therapy
  • Clinically significant history of liver disease, including viral or other hepatitis, current alcohol abuse, or cirrhosis
  • Grade ≥2 peripheral neuropathy
  • Any other diseases, active or uncontrolled intercurrent illness including, but not limited to, ongoing or active infection, symptomatic congestive heart failure, unstable angina pectoris, pulmonary dysfunction, metabolic dysfunction, psychiatric illness/social situations, physical examination finding, or clinical laboratory finding that would limit compliance with study requirements.
  • Women of childbearing potential (< 1 year amenorrheic) or sexually active males who are not employing adequate contraception (or practicing complete abstinence).
  • Female patients of childbearing potential must commit to using a reliable and appropriate method of contraception until at least 7 months after the end of last dose of study treatment.
  • Male patients with a partner of childbearing potential must agree to use a barrier method of contraception (condom) in addition to having their partner use another contraceptive method during the trial and for 7 months after the last dose of study treatment.
  • Pregnant women and women who are lactating.
  • Known human immunodeficiency virus (HIV) infection
  • Inability or unwillingness to swallow pills

Trial locations and contacts

3 sites in 1 country.

United States3 sites
  • Massachusetts General Hospital

    Boston, Massachusetts, 02114

  • Dana Farber Cancer Institute

    Boston, Massachusetts, 02215

  • Sarah Cannon Research Institute

    Nashville, Tennessee, 37203

Other trials in United States

About this study

This research study is a way of gaining new knowledge about the combination of Taselisib with other drugs in the treatment of metastatic breast cancer. Taselisib is an investigational drug which works by blocking a protein called PI3K (phosphoinositide 3-kinase) that helps cancer cells grow. This drug has been used in laboratory experiments and information from these studies suggests that this drug may help to prevent or slow the growth of cancer cells. The main purpose of this study is to find the appropriate dose of Taselisib to be used with other drugs in further clinical studies. This is an open-label, 3+3 dose-escalation phase Ib study to identify the Maximum Tolerated Dose(s) (MTD) and to identify the recommended phase 2 dose (RP2D) of Taselisib. This study will be conducted in 4 separate arms. (A-D).

Read the detailed description

This study is divided in two parts, a combination dose finding escalation part (Part 1) and a dose combination expansion part (Part 2). Participants will enter only one Part (either 1 or 2) and receive study drugs from only one combindation of study drugs, know as arms, as assigned by the main study physician. The study includes four different arms as listed below:

  • Arm A: Taselisib with Trastuzumab emtansine (also called T-DM1)
  • Arm B: Taselisib with Trastuzumab emtansine and Pertuzumab
  • Arm C: Taselisib with Pertuzumab and Trastuzumab
  • Arm D: Taselisib with Pertuzumab, Trastuzumab, and Paclitaxel

Part 1: Since we are looking for the highest dose of Taselisib that can be administered safely without severe or unmanageable side effects in participants that have breast cancer, not everyone who participates in Part 1 of this research study will receive the same dose of the Taselisib. The dose participants get will depend on the number of participants who have been enrolled in the study before and how well they have tolerated their doses.

Each combination dose will only be given to a group of 3 - 6 participants. The results from each group will be reviewed and depending on the results, a different combination dose or schedule may be investigated in the next group of participants or the same combination dose taken by a participant may be repeated with the next group of participants to investigate these results further (a different schedule means that instead of taking doses once every day, participants may take them only on some days in the week).

Part 2: The doses in this part will be based on the best combination doses from Part 1. This part will look at the potential side effects and see how your cancer responds to the drug.

Being tested
Taselisib, Trastuzumab emtansine, Pertuzumab, Trastuzumab, Paclitaxel
Keywords
Metastatic Breast Cancer, Advanced Breast Cancer, Recurrent Breast Cancer
Medical subject headings
Breast Neoplasms

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • TaselisibDrug

    Also called GCD-0032

  • Trastuzumab emtansineDrug

    Also called T-DM1, Kadcyla

  • PertuzumabDrug

    Also called Perjeta

  • TrastuzumabDrug

    Also called Herceptin

  • PaclitaxelDrug

    Also called Taxol, Onxal

Study groups in NCT02390427
Study groupRoleWhat they receive
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).
Receives: Drug: Taselisib; Drug: Trastuzumab emtansine
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).
Receives: Drug: Taselisib; Drug: Trastuzumab emtansine; Drug: Pertuzumab
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).
Receives: Drug: Taselisib; Drug: Pertuzumab; Drug: Trastuzumab
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.
Receives: Drug: Taselisib; Drug: Pertuzumab; Drug: Trastuzumab; Drug: Paclitaxel

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Maximum Tolerated Dose (MTD) of Taselisib in combination with anti-HER2 therapy(ies) and/or paclitaxel.

    Measured: 28 Days

Secondary outcomes (7)
  1. Clinical Benefit Rate (CBR) for efficacy of Taselisib in combination with anti-HER2 therapy(ies) and/or paclitaxel.

    Defined as complete response (CR) + partial response (PR) + stable disease (SD) using RECIST 1.1

    Measured: > or = 6 Months

  2. Progression Free Survival (PFS) for efficacy of Taselisib in combination with anti-HER2 therapy(ies) and/or paclitaxel.

    Defined as the time from the date of the first dose of study treatment until the date of first documentation of progressive disease (PD) or death from any cause (whichever occurs first)

    Measured: 2 Years

  3. Overall Survival for efficacy of Taselisib in combination with anti-HER2 therapy(ies) and/or paclitaxel.

    Defined as the time from the date of the first dose of study treatment until the date of death from any cause

    Measured: 2 Years

  4. Occurrence of AEs and SAEs during treatment with Taselisib in combination with anti-HER2 therapy(ies) and/or paclitaxel.

    Defined with CTCAE version 4.0

    Measured: 2 Years

  5. Occurrence of dose delays or holds

    Defined as a delay or hold of one of the study agents for more than 7 days

    Measured: More than 7 Days

  6. Occurrence of dose reductions

    Measured: 2 Years

  7. Dose Limiting Toxicity of Taselisib in combination with anti-HER2 therapy(ies) and/or paclitaxel.

    Defined as a toxicity within the DLT Assessment Window.

    Measured: 28 Days

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted17 Mar 2015 (estimated)
  2. Study start20 Apr 2015
  3. Primary completionDec 2022
  4. Study completionJul 2024

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 1
Primary purpose
Treatment
Allocation
Non-randomised
Intervention model
Parallel groups
Masking
None (open label)
Enrolment
68 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT02390427
Sponsor's protocol ID
15-024
Status last verified
Sep 2026
First submitted
11 Mar 2015
Last updated
24 Sep 2026
Results posted
No
Data monitoring committee
Yes

Questions about this trial

What is this clinical trial studying?

A Phase 1 study testing Taselisib, Trastuzumab emtansine and Pertuzumab in people with Metastatic Breast Cancer and Recurrent Breast Cancer, run by Nancy Lin, MD at 3 sites in United States.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 16 inclusion and 33 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: finished, as of the sponsor's last update on 24 Sep 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 3 sites in United States. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this phase mean?

Phase 1 studies test a treatment in a small group of people for the first time or in a new way, mainly to check safety and find the right dose.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Maximum Tolerated Dose (MTD) of Taselisib in combination with anti-HER2 therapy(ies) and/or paclitaxel. (time frame: 28 Days). It is what the study was designed to measure, not a finding.

Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 24 Sep 2026.

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