Lung Cancer Clinical Trial
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.
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.
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
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There are 46 Locations for this study
Hot Springs Arkansas, 71913, United States
Rogers Arkansas, 72758, United States
Corona California, 92879, United States
Sacramento California, 95816, United States
Whittier California, 90603, United States
Colorado Springs Colorado, 80909, United States
Denver Colorado, 80218, United States
Fort Collins Colorado, 80528, United States
Fort Myers Florida, 33916, United States
Tavares Florida, 32778, United States
Athens Georgia, 30607, United States
Atlanta Georgia, 30322, United States
Atlanta Georgia, 30341, United States
Kansas City Missouri, 64111, United States
Lebanon New Hampshire, 03756, United States
East Setauket New York, 11733, United States
Wilson North Carolina, 27893, United States
Canton Ohio, 44718, United States
Oklahoma City Oklahoma, 73117, United States
Sayre Pennsylvania, 18840, United States
Anderson South Carolina, 29621, United States
Greenville South Carolina, 29605, United States
Spartanburg South Carolina, 29303, United States
Knoxville Tennessee, 37920, United States
Nashville Tennessee, 37208, United States
Nashville Tennessee, 37232, United States
Dallas Texas, 75246, United States
Houston Texas, 77030, United States
Houston Texas, 77090, United States
Lubbock Texas, 79415, United States
Tyler Texas, 75702, United States
Tyler Texas, 75708, United States
Fairfax Virginia, 22031, United States
Norfolk Virginia, 23502, United States
Vancouver Washington, 98684, United States
Brasschaat , 2930, Belgium
Banja Luka , 78000, Bosnia and Herzegovina
Sarajevo , 71000, Bosnia and Herzegovina
Osijek , 31000, Croatia
Zagreb , 10000, Croatia
Zagreb , 10000, Croatia
Skopje , 1000, North Macedonia
Belgrade , 11000, Serbia
Belgrade , 11000, Serbia
Belgrade , 11000, Serbia
Nis , 18204, Serbia
Sremska Kamenica , 21204, Serbia
Kosice , 04191, Slovakia
Poprad , 05801, Slovakia
Golnik , , Slovenia
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