Talazoparib and Thoracic RT for ES-SCLC (Talazoparib)

A Phase I Study of Talazoparib and Consolidative Thoracic Radiotherapy for Extensive Stage Small Cell Lung Cancer

This is a phase I, dose escalating study evaluating the safety of combining talazoparib and low dose consolidative thoracic radiotherapy for small cell lung cancer patients. This study will also determine the maximum tolerated dose (MTD) of talazoparib in combination with low dose thoracic radiotherapy.

Patients will start on talazoparib on day 1 of study intervention, and will continue to orally take talazoparib until the last day of radiation therapy. Up to 24 patients will be enrolled to the study, where the first 3 patients will start with a starting dose level of talazoparib is 0.5 mg PO once daily. This will increase to 1mg daily with each new cohort.

Study Overview

• Status: Recruiting
• Conditions: Lung Cancer; Small-Cell Lung Cancer
• Intervention / Treatment: Other: Talazoparib in Combination with Low Dose Radiotherapy (RT)

Detailed Description

This is a phase I, dose escalating study evaluating the safety of combination talazoparib and low dose consolidative thoracic radiotherapy for extensive-stage small cell lung cancer patients with at least stable disease after standard of care 4 - 6 cycles of chemotherapy (a platinum agent and etoposide). This study will also determine the maximum tolerated dose (MTD) of talazoparib in combination with low dose thoracic radiotherapy. Secondary objectives will be to examine clinical outcomes, including locoregional recurrence within the radiation field, progression-free survival, overall survival and acute/chronic toxicities up to 1 year.

Patients will start on talazoparib on day 1 of study intervention, and will continue to orally take talazoparib until the last day of RT. Patient will start low dose RT on day 6-9, and will continue for 10 fractions throughout 2 weeks. Up to 24 patients will be enrolled to the study, where the first 3 patients will start with a starting dose level of talazoparib is 0.5 mg PO once daily. This will increase to 1mg daily with each new cohort. Patients will be monitored weekly during study treatment, and followed up at 3 weeks, and every 3 months after for 1 year.

• Study Type: Interventional
• Enrollment (Estimated): 24
• Phase: Phase 1

Contacts and Locations

• Study Contact: Name: Benjamin Lok, MD; Phone Number: 5819 416-946-4501; Email: Benjamin.Lok@rmp.uhn.ca

Study Locations

• Canada
  • Ontario
    • Toronto, Ontario, Canada, M5G 2M9
      • Recruiting
      • Princess Margaret Cancer Center, University Health Network
      • Contact: Benjamin Lok, MD; Phone Number: 5819 416-946-4501; Email: Benjamin.Lok@rmp.uhn.ca

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

• Histological documented diagnosis of SCLC confirmed by a UHN pathologist.
• Documented extensive disease
• Completion of induction chemotherapy, 4-6 cycles of a platinum agent and etoposide.
• No disease progression (i.e.SD or better response by RECIST 1.1) at the completion of chemotherapy.
• Eastern Cooperative Oncology Group (ECOG) performance status 0-2 (Karnosfsky Performance Score (KPS) ≥50; see Appendix B).
• Adequate organ and marrow function,
• Postmenopausal or evidence of non-childbearing status for women of childbearing potential negative urine or serum pregnancy test within 28 days of study treatment and confirmed prior to treatment on day 1.

Exclusion Criteria:

• Untreated brain metastases.
• Previous radiotherapy to thorax (prior breast RT is permitted).
• Patients receiving any systemic chemotherapy, radiotherapy or immunotherapy (except for standard of care treatments or palliative reasons) within 3 weeks prior to study treatment.
• Exposure to an investigational product within 30 days or 5 half-lives (whichever is longer) prior to start of the current study drug.
• Any previous treatment with PARP inhibitor, including talazoparib.
• Concomitant use of strong P-gp inhibitors
• Concomitant use of other known P-gp inhibitors, P-gp inducers, or BCRP inhibitors
• Persistent toxicities (>Common Terminology Criteria for Adverse Event (CTCAE) grade 2) caused by previous cancer therapy, excluding alopecia.
• Patients with myelodysplastic syndrome/acute leukaemia or with features suggestive thereof.
• Major surgery within 2 weeks of study treatment initiation and patients must have recovered from any effects of any major surgery.
• Patients considered a poor medical risk due to a serious, uncontrolled medical disorder, non-malignant systemic disease or active/uncontrolled infection. Examples include, but are not limited to, uncontrolled ventricular arrhythmia, recent (within 3 months) myocardial infarction, uncontrolled major seizure disorder, unstable spinal cord compression, superior vena cava syndrome, extensive interstitial bilateral lung disease on High Resolution Computed Tomography (HRCT) scan or any psychiatric disorder that prohibits obtaining informed consent
• Patients unable to swallow orally administered medication and patients with gastrointestinal disorders likely to interfere with absorption of the study medication.
• Immunocompromised patients,
• Previous allogenic bone marrow transplant or double umbilical cord blood transplantation (dUCBT).
• Whole blood transfusions in the last 120 days prior to entry to the study
• Other malignancy within the last 5 years
• Patients with spinal cord compression

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: N/A
• Interventional Model: Sequential Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm

Intervention / Treatment

Experimental: Talazoparib in Combination with Low Dose RT; Patients will start on talazoparib on day 1 of study intervention, and will continue to orally take talazoparib until the last day of RT (until day 20-23). Patient will start low dose RT on day 6-9, and will continue for 10 fractions throughout 2 weeks. Talazoparib dose levels will start at 0.5mg daily and increase to 1mg if dose limiting toxicites are not observed. Toxicities include renal impairment and other treatment related toxicities Grade ≥3. Patients will be monitored weekly during study treatment, and followed up at 3 weeks, and every 3 months after for 1 year.

Other: Talazoparib in Combination with Low Dose Radiotherapy (RT); Dose escalation model to determine the safety and MTD of talazoparib in combination with low dose RT.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Safety of Talazoparib in Combination with Low Dose Thoracic Radiotherapy	Safety will be measured by assessing all adverse events as determined by the investigator using CTCAE v.5.0.	Up to 3 years upon enrollment
Maximum Tolerated Dose (MTD) of Talazoparib in Combination with Low Dose Thoracic Radiotherapy	MTD will be defined as the maximum dose by a standard 3+3 design	Up to 1 year

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Loco-regional Recurrence	Loco-regional recurrence will be assessed by using RECIST v1.1 criteria	6 months and 1 year
Progression-Free Survival (PFS)	PFS will be defined as the time of start of radiotherapy to first local/loco-regional or distance recurrence event, or death.	6 months and 1 year
Overall Survival (OS)	OS will be defined as the time from the start of radiotherapy to death from any cause.	6 months and 1 year
Acute Toxicities	Acute toxicities will be assessed by physician-graded CTCAE.	Up to 1 year
Chronic Toxicities	Chronic toxicities will be assessed by physician-graded CTCAE.	Up to 1 year

Collaborators and Investigators

• Sponsor: University Health Network, Toronto
• Collaborators: Pfizer
• Investigators: Principal Investigator: Benjamin Lok, MD, Princess Margaret Cancer Center

Study record dates

Study Major Dates

• Study Start (Actual): October 5, 2020
• Primary Completion (Estimated): September 1, 2027
• Study Completion (Estimated): September 1, 2027

Study Registration Dates

• First Submitted: November 18, 2019
• First Submitted That Met QC Criteria: November 18, 2019
• First Posted (Actual): November 20, 2019

Study Record Updates

• Last Update Posted (Actual): March 5, 2026
• Last Update Submitted That Met QC Criteria: March 3, 2026
• Last Verified: March 1, 2026

More Information

Terms related to this study

• Keywords: Chemotherapy; Talazoparib; Thoracic Radiotherapy
• Additional Relevant MeSH Terms: Neoplasms by Site; Neoplasms; Respiratory Tract Diseases; Lung Diseases; Respiratory Tract Neoplasms; Thoracic Neoplasms; Carcinoma, Bronchogenic; Bronchial Neoplasms; Lung Neoplasms; Small Cell Lung Carcinoma; Therapeutics; Radiotherapy; talazoparib
• Other Study ID Numbers: 19-5621

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No
• product manufactured in and exported from the U.S.: No