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NCT Number: NCT02514447

Trilaciclib (G1T28) in Patients With Previously Treated Extensive Stage SCLC Receiving Topotecan Chemotherapy

This was a study to investigate the potential clinical benefit of trilaciclib (G1T28), a Cyclin Dependent Kinase (CDK) 4/6 inhibitor, in preserving the bone marrow and the immune system, in order to decrease chemotherapy-induced myelosuppression and improve anti-tumor efficacy when administered prior to topotecan in patients previously treated for extensive-stage SCLC.

The study consisted of 2 parts: a limited open-label, dose-finding portion (Part 1), and a randomized double-blind portion (Part 2). Both parts included 3 study phases: Screening Phase, Treatment Phase, and Survival Follow-up Phase. The Treatment Phase began on the day of first dose with study treatment and completes at the Post-Treatment Visit.

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Key information

Conditions

Small Cell Lung Cancer Bronchial Neoplasms Carcinoma, Bronchogenic Lung Diseases Lung Neoplasms Neoplasms Neoplasms by Site Respiratory Tract Diseases Respiratory Tract Neoplasms Small Cell Lung Carcinoma Thoracic Neoplasms

Age range

18 year and older

Sex eligibility

All sexes

Study type

Interventional

Phase

Phase 1 / Phase 2

Primary location

AZ Klina, Brasschaat, Belgium

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About this study

Overall, up to 130 patients were planned to be enrolled in the study. In Part 1, approximately 40 patients were planned to be enrolled, assuming 9 to 10 cohorts. Part 1 was open-label, and no randomization or blinding was required. In Part 2A, approximately 45 patients were to be enrolled and randomly assigned (2:1) to trilaciclib (240 mg/m2) and topotecan (0.75 mg/m2) or placebo and topotecan (1.5 mg/m2). In Part 2B, approximately 45 patients were to be enrolled and randomly assigned (2:1) to trilaciclib (240 mg/mg2) and topotecan (1.5 mg/m2) or placebo and topotecan (1.5 mg/m2).

Patients who received placebo in Part 2A and Part 2B were to be combined into a single placebo group for the analysis to compare with trilaciclib+topotecan 1.5 mg/m2 with placebo + topotecan 1.5 mg/m2 (proximately 30 per treatment group).

The sample size calculation was to demonstrate the superiority of trilaciclib + topotecan 1.5 mg/m2 over placebo + topotecan 1.5 mg/m2 with respect to at least 1 of the primary endpoints. The overall type I error rate was 1-sided 0.10. Using the most conservative Bonferroni procedure for the 2 primary endpoints, a 1-sided individual type I error rate 0.10/2=0.05 was assigned to each outcome variable (DSN in Cycle 1 and occurrence of SN) in the sample size calculation. Assuming a common standard deviation of 2.5, a difference in the duration of SN in Cycle 1 of at least 2 days between the treatment groups, a sample size of 28 per arm was required to have 90% power to detect the assumed treatment effect. For occurrence of SN, assuming the event rate was 45% for placebo group, to detect an absolute reduction of 37% by trilaciclib group with 90% power would require a sample size of at least 29 per arm. Thus, 30 per arm was needed to ensure 90% power to detect assumed treatment effect for DSN in Cycle 1 and occurrence of SN. All calculations were carried out using the POWER procedure in SAS®, Version 9.4 procedure in SAS®, Version 9.4 or higher.

The results from endpoints that were commonly collected at Part 1 and part 2 are presented together in this report.

The posted results represent the final results of Study G1T28-03, a Phase 1b/2a safety and pharmacokinetic (PK) study of trilaciclib (G1T28) in patients with previously treated extensive-stage small cell lung cancer (SCLC) receiving topotecan chemotherapy in the second/third-line (2/3L) setting. The final myelopreservation efficacy results for both parts and exposure for Part 1 are from database lock 1 (data cut-off [DCO] for Primary Completion Date [PCD] 28 September 2018). The final anti-tumor efficacy (BOR, DOR, PFS) for both parts, final overall survival for Part 1 and exposure data from Part 2 are from a second database lock 2 (DCO 31 May 2019) and the final overall survival for Part 2 and safety (adverse events) are through the end of the study on October 4, 2021 which resulted in the final database lock (DCO 01 Nov 2021).

The maximum time frames provided reflect the time from when the first patient could be evaluated for an endpoint (ie. date of first dose of first patient) to the time when the data from both parts presented for that endpoint was considered final.

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Key Inclusion Criteria:

  • Male or female subjects aged ≥18 years
  • Confirmed diagnosis of SCLC by histology or cytology, preferably including the presence of neuroendocrine features by immunohistochemistry
  • Progression during or after prior first- or second-line chemotherapy and eligible to receive topotecan therapy
  • At least 1 target lesion that is measurable by RECIST, Version 1.1
  • Eastern Cooperative Oncology Group (ECOG) performance status of 0 - 2
  • Adequate organ function

Key Exclusion Criteria:

  • Presence of brain metastases requiring immediate treatment with radiation therapy or steroids.
  • Uncontrolled ischemic heart disease or uncontrolled symptomatic congestive heart failure
  • Known history of stroke or cerebrovascular accident within 6 months prior to enrollment
  • Other uncontrolled serious chronic disease or conditions that in the investigator's opinion could affect compliance or follow-up in the protocol
  • Concurrent radiotherapy to any site or radiotherapy within 2 weeks prior to enrollment or previous radiotherapy to the target lesion sites
  • Receipt of any systemic chemotherapy regimen within 4 weeks prior to enrollment or a noncytotoxic investigational medication within 2 weeks prior to enrollment
  • History of topotecan treatment for SCLC

Treatment and study plan

Trilaciclib

Drug

Other names: G1T28, CDK 4/6 inhibitor

Placebo

Drug

Topotecan

Drug

Primary outcomes

  1. Duration of Severe (Grade 4) Neutropenia in Cycle 1

    Time frame: Evaluated for Cycle 1 (i.e., from date of first dose of study drug (Part 1)/randomization (Part 2) to the end of Cycle 1, each cycle = 21 days)

    Duration of severe neutropenia (DSN; days) was defined as the number of days from the date of the first ANC value of <0.5 × 10^9/L observed between start of cycle and end of cycle to the date of the first ANC value ≥0.5 × 10^9/L that met the following criteria: (1) occurred after the ANC value of <0.5 × 10^9/L and (2) no other ANC values <0.5 × 10^9/L occurred between this day and end of cycle. DSN is set to 0 for patients who did not experience SN in a cycle, including those who were randomized but never treated. Data from unscheduled visits and the actual assessment date (rather than visit date) were included in the derivation.

  2. Occurrence of Severe (Grade 4) Neutropenia

    Time frame: During the treatment period. From date of first dose (Part 1)/randomization (Part 2), 21 day treatment cycles continue until disease progression, unacceptable toxicity, or discontinuation by the patient or investigator (assessed up to 1090 days).

    Number of Participants with severe (Grade 4) neutropenia (SN) was a binary variable. If a patient had at least 1 absolute neutrophil count value <0.5 × 10^9/L during the Treatment Period, the patient was assigned as Yes to the occurrence of SN; otherwise, it was No.

  3. Assess the Dose Limiting Toxicities (DLTs) of G1T28/Trilaciclib Administered With Topotecan in Part 1

    Time frame: Evaluated for Cycle 1 (i.e., from date of first dose of study drug (Part 1) to the end of Cycle 1, each cycle = 21 days)

    The percentage of patients experiencing DLTs in Part 1 of the study in each cohort, including:

    • Absolute neutrophil count (ANC) < 0.5 × 10^9/L lasting for ≥ 7 days
    • ≥ Grade 3 neutropenic infection/febrile neutropenia
    • Grade 4 thrombocytopenia or ≥ Grade 3 thrombocytopenia with bleeding
    • Unable to start next cycle of chemotherapy due to lack of recovery to an ANC ≥ 1.5 × 10^9/L and platelet count ≥ 100 × 10^9/L; a delay of up to 1 week from the scheduled start of Cycle 2 is allowed for recovery of ANC and platelet count, and is not considered a DLT
    • ≥ Grade 3 nonhematologic toxicity (nausea, vomiting, and diarrhea failing maximal medical management; fatigue lasting for > 72 hours)

Secondary outcomes

  1. Pharmacokinetic Profile for Trilaciclib (G1T28) When Administered With Topotecan

    Time frame: Part 1 of the study during Cycle 1 Day 4 : predose, 0.5, 1, 1.5, 2, 2.5, 3, 4.5, 6.5, 8.5 (optional), and 24.5 hours post dose. Part 2 of the study during Cycle 1 Day 4 : predose, 0.5, 1, between 3 to 4 hours and between 5.5 to 6.5 hours post dose.

    Maximum concentration (Cmax) of trilaciclib (G1T28) when administered with topotecan

  2. Progression Free Survival (PFS)

    Time frame: From date of first dose of study drug (Part 1)/randomization (Part 2), until date of documented disease progression or death due to any cause (evaluated up to a maximum of 1335 days).

    Median time (months) and 95% CI from date of first dose of study drug/randomization until date of documented disease progression or death due to any cause.

    Investigators followed the Response Evaluation Criteria in Solid Tumors (RECIST), Version 1.1 guidelines for tumor assessments to determine progression. Progressive Disease (PD) was defined as at least a 20% increase in the sum of diameters of target lesions, taking as reference the smallest sum on study (this includes the baseline sum if that is the smallest on study). In addition to the relative increase of 20%, the sum must also demonstrate an absolute increase of at least 5 mm. (Note: the appearance of one or more new lesions is also considered progression).

  3. Overall Survival (OS)

    Time frame: From date of first dose of study drug (Part 1)/randomization (Part 2) until the date of death due to any cause (evaluated up to a maximum of 2220 days).

    Median time (months) and 95% CI from date of first dose date of study drug/randomization until date of death. Patients who do not die during the study will be censored at the date last known to be alive.

  4. Assess the Hematologic Profile of G1T28/Trilaciclib Administered With Topotecan

    Time frame: During the treatment period. From date of first dose (Part 1)/randomization (Part 2), 21 day treatment cycles continue until disease progression, unacceptable toxicity, or discontinuation by the patient or investigator (assessed up to 1090 days).

    The weekly event rate of Major Adverse Hematologic Events (MAHE) events

  5. Tumor Response Based on RECIST, Version 1.1

    Time frame: From date of first dose of study drug (Part 1)/randomization (Part 2) until the occurrence of progressive disease, withdrawal of consent, or initiation of subsequent anti-cancer therapy, (assessed up to a maximum of 1335 days).

    The percentage of patients who fall into each category of Best overall response (BOR) as defined by RECIST, Version 1.1.

    Complete Response (CR): Disappearance of all target lesions. Partial Response (PR): At least a 30% decrease in the sum of diameters of target lesions.

    Progressive Disease (PD): At least a 20% increase in the sum of diameters of target lesions.

    Stable Disease (SD): Neither sufficient shrinkage to qualify for PR nor sufficient increase to qualify for PD.

    When no imaging/measurement is done, the patient is not evaluable (NE); and if only a subset of lesion measurements are made, usually the case is also considered NE.

  6. Occurrence of RBC Transfusions

    Time frame: During the treatment period. From date of first dose (Part 1)/randomization (Part 2), 21 day treatment cycles continue until disease progression, unacceptable toxicity, or discontinuation by the patient or investigator (assessed up to 1056 days).

    Percentage of patients requiring a RBC transfusion on/after week 5

  7. Need for Treatment With Hematopoietic Growth Factors

    Time frame: During the treatment period. From date of first dose (Part 1)/randomization (Part 2), 21 day treatment cycles continue until disease progression, unacceptable toxicity, or discontinuation by the patient or investigator (assessed up to 1090 days).

    Percentage of patients requiring G-CSF administration.

  8. Chemotherapy Cycles and Modifications Overall

    Time frame: During the treatment period. From date of first dose, 21 day treatment cycles continue until disease progression, unacceptable toxicity, or discontinuation by the patient or investigator (assessed up to a maximum of 1335 days).

    Average exposure and cycle modifications in chemotherapy (topotecan)

  9. Pharmacokinetic Profile for Topotecan When Administered With Trilaciclib (G1T28)

    Time frame: Part 1 of the study during Cycle 1 Day 4 : predose, 0.5, 1, 1.5, 2, 2.5, 3, 4.5, 6.5, 8.5 (optional), and 24.5 hours post dose. Part 2 of the study during Cycle 1 Day 4 : predose, 0.5, 1, between 3 to 4 hours and between 5.5 to 6.5 hours post dose.

    Maximum concentration (Cmax) of topotecan when administered with trilaciclib (G1T28)

  10. Duration of Response (DOR)

    Time frame: From date of first dose of study drug (Part 1)/randomization (Part 2) until the occurrence of progressive disease, withdrawal of consent, or initiation of subsequent anti-cancer therapy, (assessed up to a maximum of 1335 days).

    The median months and 95% CIs of duration of response.

  11. Occurrence of Intravenous (IV) Antibiotic Use

    Time frame: During the treatment period. From date of first dose (Part 1)/randomization (Part 2), 21 day treatment cycles continue until disease progression, unacceptable toxicity, or discontinuation by the patient or investigator (assessed up to 1090 days).

    Percentage of patients requiring systemic/IV antibiotics

  12. Occurrence of Platelet Transfusions

    Time frame: During the treatment period. From date of first dose (Part 1)/randomization (Part 2), 21 day treatment cycles continue until disease progression, unacceptable toxicity, or discontinuation by the patient or investigator (assessed up to 1090 days).

    Percentage of patients requiring a platelet transfusion

  13. Occurrence of Febrile Neutropenia Adverse Events

    Time frame: During the treatment period. From date of first dose (Part 1)/randomization (Part 2), 21 day treatment cycles continue until disease progression, unacceptable toxicity, or discontinuation by the patient or investigator (assessed up to 1090 days).

    Percentage of patients who experience febrile neutropenia adverse events

  14. Occurrence of Infection Serious Adverse Events (SAEs)

    Time frame: During the treatment period. From date of first dose (Part 1)/randomization (Part 2), 21 day treatment cycles continue until disease progression, unacceptable toxicity, or discontinuation by the patient or investigator (assessed up to 1090 days).

    Percentage of patients experiencing an SAE that codes to the Medical Dictionary for Regulatory Activities (MedDRA) system organ class (SOC) of Infections and Infestations

  15. Occurrence of Pulmonary Infection Serious Adverse Events (SAEs)

    Time frame: During the treatment period. From date of first dose (Part 1)/randomization (Part 2), 21 day treatment cycles continue until disease progression, unacceptable toxicity, or discontinuation by the patient or investigator (assessed up to 1090 days).

    Percentage of patients experiencing an SAE that codes to the Medical Dictionary for Regulatory Activities (MedDRA) system organ class (SOC) of Infections and Infestations and falls into a preferred term (PT) categorized as a pulmonary infection custom MedDRA query (CMQ)

  16. Dose Reductions in Chemotherapy (Topotecan)

    Time frame: During the treatment period. From date of first dose (Part 1)/randomization (Part 2), 21 day treatment cycles continue until disease progression, unacceptable toxicity, or discontinuation by the patient or investigator (assessed up to 1090 days).

    Overall event rate of dose reductions in chemotherapy (topotecan)

  17. Occurrence of Grade 3 and 4 Hematologic Toxicities

    Time frame: During the treatment period. From date of first dose (Part 1)/randomization (Part 2), 21 day treatment cycles continue until disease progression, unacceptable toxicity, or discontinuation by the patient or investigator (assessed up to 1090 days).

    The count of patients with any hematologic lab value that meets the CTCAE toxicity grade criteria for ≥ Grade 3 and the value is treatment emergent (occurs after first dose of study drug). Labs include: Hemoglobin (HGB), hematocrit, white blood cell (WBC), platelet counts, ANC, ALC, Monocyte Absolute, Basophil Absolute, and Eosinophil Absolute.

  18. Occurrence of Grade 4 and Grade 3/4 Decreased Platelet Count Laboratory Values (Thrombocytopenia)

    Time frame: During the treatment period. From date of first dose (Part 1)/randomization (Part 2), 21 day treatment cycles continue until disease progression, unacceptable toxicity, or discontinuation by the patient or investigator (assessed up to 1090 days).

    The count of patients with any platelet lab value that meets the CTCAE toxicity grade criteria for ≥ Grade 3 and the value is treatment emergent (occurs after first dose of study drug).

  19. Occurrence of Erythropoietin-stimulating Agent (ESA) Administrations

    Time frame: During the treatment period. From date of first dose (Part 1)/randomization (Part 2), 21 day treatment cycles continue until disease progression, unacceptable toxicity, or discontinuation by the patient or investigator (assessed up to 1090 days).

    The count of patients who received any ESA administration.

  20. Chemotherapy Exposure

    Time frame: During the treatment period. From date of first dose, 21 day treatment cycles continue until disease progression, unacceptable toxicity, or discontinuation by the patient or investigator (assessed up to a maximum of 1335 days).

    Average duration of exposure to chemotherapy (topotecan) in days.

Sponsors and collaborators

Lead sponsor

G1 Therapeutics, Inc.

Industry

Registry information

Official study title

Phase 1b/2a Safety and Pharmacokinetic Study of G1T28 in Patients With Previously Treated Extensive Stage Small Cell Lung Cancer (SCLC) Receiving Topotecan Chemotherapy

Important dates

Study start
2015
Primary completion
2018
Study completion
2021
First posted
Aug 3, 2015
Registry last updated
Sep 25, 2025

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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