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A Study Evaluating the Safety of Inavolisib and Fulvestrant With or Without Palbociclib in Participants With Advanced Breast Cancer (ABC) and Type 2 Diabetes

A Phase II Prospective, Open-Label Safety Study of Inavolisib and Fulvestrant With or Without Palbociclib in Participants With PIK3CA-Mutated Hormone Receptor-Positive, HER2-Negative Advanced Breast Cancer and Type 2 Diabetes

Status
Not yet recruiting
Phases
Phase 2
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT07748208
Enrollment
40
Registered
2026-08-05
Start date
2026-10-30
Completion date
2029-09-30
Last updated
2026-09-16

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Breast Cancer, Diabetes Type II

Brief summary

This study will evaluate the safety of inavolisib in combination with fulvestrant, with or without palbociclib, in participants with PIK3CA-mutated, HR+, HER2-negative ABC and type 2 diabetes.

Interventions

DRUGInavolisib

Participants will receive oral inavolisib on Days 2-28 of each 28-day cycle.

DRUGFulvestrant

Participants will receive intramuscular (IM) fulvestrant on Days 1 and 15 of Cycle 1, and then on Day 1 of each subsequent 28-day cycle.

DRUGPalbociclib

Some participants will receive oral palbociclib on Days 1-21 of each 28-day cycle.

Sponsors

Hoffmann-La Roche
Lead SponsorINDUSTRY

Study design

Allocation
NA
Intervention model
SINGLE_GROUP
Primary purpose
TREATMENT
Masking
NONE

Eligibility

Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No

Inclusion criteria

* Type 2 diabetes with laboratory fasting blood glucose \< 185 milligrams per deciliter (mg/dL) and HbA1c \<= 8% on any stable anti-hyperglycemic regimen excluding insulin short-term insulin dosing * Eligible for triplet of inavolisib, fulvestrant and palbociclib: no prior systemic therapy for locally advanced unresectable or metastatic disease * Confirmed diagnosis of HR+/HER2- breast cancer * Confirmation of biomarker eligibility (detection of specified mutation(s) of PIK3CA via specified test) * Measurable disease per Response Evaluation Criteria in Solid Tumors, Version 1.1 (RECIST v1.1) * Eastern Cooperative Oncology Group (ECOG) Performance Status of 0-1 * Adequate hematologic and organ function within 14 days prior to initiation of study treatment

Exclusion criteria

* Pregnant or breastfeeding, or intention of becoming pregnant during the study or within the time frame in which contraception is required * Metaplastic breast cancer * Any history of Type 1 diabetes * Severe hyper- or hypoglycemia event within 6 months of initiation of study treatment * Any history of leptomeningeal disease or carcinomatous meningitis * Known and untreated, or active central nervous system (CNS) metastases Participants with a history of treated CNS metastases are eligible * Active inflammatory or conditions in either eye or history of idiopathic or autoimmune-associated uveitis in either eye * Symptomatic active lung disease * History of active bowel inflammation or active inflammatory bowel disease

Design outcomes

Primary

MeasureTime frame
Percentage of Participants With Grade 4 Hyperglycemia Adverse Events (AEs) After Cycle 1Up to approximately 21 months
Percentage of Participants Hospitalized for Hyperglycemia or its Complications After Cycle 1Up to approximately 21 months
Percentage of Participants with AEs After Cycle 1Up to approximately 21 months

Secondary

MeasureTime frame
Percentage of Particiants With Inavolisib-related Hyperglycemia AEs After Cycle 1Up to Cycle 1 (each cycle is 28 days)
Percentage of Participants With Inavolisib Discontinuations due to Hyperglycemia and its ComplicationsUp to approximately 21 months
Percentage of Participants With Inavolisib Dose Reduction due to HyperglycemiaUp to approximately 21 months
Percentage of Participants With Return of Hemoglobin A1c or Glycated Hemoglobin (HbA1c) to Within 10% of Baseline Within 90 Days After Inavolisib DiscontinuationUp to approximately 21 months
Number of Participants Reporting Presence,Frequency,Severity,&/or Degree of Interference with Daily Function of Selected Symptomatic Treatment Toxicities Assessed by NCI Patient-Reported Outcomes Common Terminology Criteria for AEs (PRO-CTCAE)Up to approximately 21 months
Percentage of Participants Reporting Each Response Option at Each Time Point for the Treatment Side-Effect Bother Item (GP5) From the Functional Assessment of Cancer Therapy - General (FACT-G) QuestionnaireUp to approximately 21 months
Change from Baseline in Symptomatic Treatment-Related Toxicities as Assessed Through use of the PRO-CTCAEBaseline, Up to approximately 21 months
Change from Baseline in Treatment Side-Effect Bother as Assessed Through use of the FACT-G General Population, Question 5 (GP5) ItemBaseline, Up to approximately 21 months
Objective Response Rate (ORR)Up to approximately 21 months
Best Overall Response Rate (BOR)Up to approximately 21 months
Duration of Response (DOR)Up to approximately 21 months
Progression-Free Survival (PFS)Up to approximately 21 months
Overall Survival (OS)Up to approximately 21 months
Mean and Mean Change From Baseline in Physical Function Score as Assessed by European Organisation for Research and Treatment of Cancer Item Library 17 (EORTC-IL17)Baseline, up to approximately 21 months
Mean and Mean Change From Baseline in Role Function Score as Assessed by EORTC-IL17Baseline, up to approximately 21 months
Mean and Mean Change From Baseline in Health-Related Quality of Life (HRQoL) Score as Assessed by EORTC-IL17Baseline, up to approximately 21 months

Contacts

CONTACTReference Study ID Number: GO45322 https://forpatients.roche.com/ No attachments to email below.
global-roche-genentech-trials@gene.com888-662-6728 (U.S. and Canada)
CONTACTFastest response: use the inquiry form. https://www.gene.com/contact-us/submit-medical-inquiry
STUDY_DIRECTORClinical Trials

Hoffmann-La Roche

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Sep 17, 2026