10 min
JCO Article Insights: Phase III POSEIDON Clinical Trial Results Journal of Clinical Oncology (JCO) Podcast
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- Science
In this JCO Article Insights episode, Emily Zabor summarizes two articles from the February 20th, 2023 Journal of Clinical Oncology issue: "Durvalumab With or Without Tremelimumab in Combination With Chemotherapy as First-Line Therapy for Metastatic Non–Small-Cell Lung Cancer: The Phase III POSEIDON Study" by Johnson, et al and "The POSEIDON Trial: Will Secondary End Points Change Our Clinical Practice?" by Remon, et al.
The Original Report by Johnson, et al describes results of the Phase III POSEIDON clinical trial. The accompanying editorial by Remon, et al discusses the findings of a significant progression-free survival and overall survival benefit for the combination of tremelimumab plus durvalumab plus chemotherapy as compared to chemotherapy alone, which were secondary endpoints in the trial.
TRANSCRIPT
Emily Zabor: Welcome to JCO Article Insights for the February 20, 2023, issue of JCO. I’m your host, Emily Zabor, JCO Biostatistics Editorial Fellow.
Today, I will be providing summaries for two articles. The first article, titled ‘Durvalumab With or Without Tremelimumab in Combination With Chemotherapy as First-Line Therapy for Metastatic Non–Small-Cell Lung Cancer: The Phase III POSEIDON Study,’ by Dr. Melissa Johnson and colleagues, describes the results of the Phase III POSEIDON clinical trial. POSEIDON was a randomized Phase III clinical trial in patients with metastatic non-small cell lung cancer. The trial had a three-arm design to evaluate the efficacy of tremelimumab plus durvalumab plus chemotherapy; durvalumab plus chemotherapy; and chemotherapy alone in a first-line treatment setting. The two immunotherapies were selected for study because of their complementary mechanisms of action. Tremelimumab is an anti-CTLA-4 antibody which can diversify T-cell responses and lead to increased tumor infiltration. Durvalumab is an anti-PDL1 antibody which can enhance T-cell function. Chemotherapy is still an important treatment option for early disease control and potential for immune priming.
Patients in the POSEIDON trial were randomized to the three arms with equal allocation. The co-primary endpoints for the trial were progression-free survival and overall survival for the comparison of durvalumab plus chemotherapy vs. chemotherapy alone. Then, a hierarchical multiple-testing procedure with a gatekeeping strategy was used across the primary endpoints and key secondary endpoints. Gatekeeping procedures are a way of controlling the type I error rate across multiple groups of null hypotheses that have a hierarchical structure, meaning that some of the hypotheses are considered more important than others. In this case, the plan was to first test for differences in progression-free survival and overall survival between the durvalumab plus chemotherapy and chemotherapy alone arms. Then, if either of those tests had a significant p-value so that the null hypothesis of no difference between groups was rejected, tests for differences in progression-free survival and overall survival between the tremelimumab plus durvalumab plus chemotherapy and chemotherapy alone arms would be conducted. Additional levels of testing could be conducted for other secondary endpoints following significance at the previous level. These types of gatekeeping procedures are a rigorous way of controlling the type I error of the entire study at 5% while still allowing multiple tests to possibly be conducted.
The efficacy analyses were conducted in the intention-to-treat population, which included 338 patients on the tremelimumab plus durvalumab plus chemotherapy arm, 338 patients on the durvalumab plus chemotherapy arm, and 337 patients on chemotherapy alone. The median follow-up among those without an event was 10.3 months for progression-free survival and 34.9 months for overall survival. The findings for the co-primary endpoints were that progression-free survival was significantly improved with durvalumab plus chemotherapy ver
In this JCO Article Insights episode, Emily Zabor summarizes two articles from the February 20th, 2023 Journal of Clinical Oncology issue: "Durvalumab With or Without Tremelimumab in Combination With Chemotherapy as First-Line Therapy for Metastatic Non–Small-Cell Lung Cancer: The Phase III POSEIDON Study" by Johnson, et al and "The POSEIDON Trial: Will Secondary End Points Change Our Clinical Practice?" by Remon, et al.
The Original Report by Johnson, et al describes results of the Phase III POSEIDON clinical trial. The accompanying editorial by Remon, et al discusses the findings of a significant progression-free survival and overall survival benefit for the combination of tremelimumab plus durvalumab plus chemotherapy as compared to chemotherapy alone, which were secondary endpoints in the trial.
TRANSCRIPT
Emily Zabor: Welcome to JCO Article Insights for the February 20, 2023, issue of JCO. I’m your host, Emily Zabor, JCO Biostatistics Editorial Fellow.
Today, I will be providing summaries for two articles. The first article, titled ‘Durvalumab With or Without Tremelimumab in Combination With Chemotherapy as First-Line Therapy for Metastatic Non–Small-Cell Lung Cancer: The Phase III POSEIDON Study,’ by Dr. Melissa Johnson and colleagues, describes the results of the Phase III POSEIDON clinical trial. POSEIDON was a randomized Phase III clinical trial in patients with metastatic non-small cell lung cancer. The trial had a three-arm design to evaluate the efficacy of tremelimumab plus durvalumab plus chemotherapy; durvalumab plus chemotherapy; and chemotherapy alone in a first-line treatment setting. The two immunotherapies were selected for study because of their complementary mechanisms of action. Tremelimumab is an anti-CTLA-4 antibody which can diversify T-cell responses and lead to increased tumor infiltration. Durvalumab is an anti-PDL1 antibody which can enhance T-cell function. Chemotherapy is still an important treatment option for early disease control and potential for immune priming.
Patients in the POSEIDON trial were randomized to the three arms with equal allocation. The co-primary endpoints for the trial were progression-free survival and overall survival for the comparison of durvalumab plus chemotherapy vs. chemotherapy alone. Then, a hierarchical multiple-testing procedure with a gatekeeping strategy was used across the primary endpoints and key secondary endpoints. Gatekeeping procedures are a way of controlling the type I error rate across multiple groups of null hypotheses that have a hierarchical structure, meaning that some of the hypotheses are considered more important than others. In this case, the plan was to first test for differences in progression-free survival and overall survival between the durvalumab plus chemotherapy and chemotherapy alone arms. Then, if either of those tests had a significant p-value so that the null hypothesis of no difference between groups was rejected, tests for differences in progression-free survival and overall survival between the tremelimumab plus durvalumab plus chemotherapy and chemotherapy alone arms would be conducted. Additional levels of testing could be conducted for other secondary endpoints following significance at the previous level. These types of gatekeeping procedures are a rigorous way of controlling the type I error of the entire study at 5% while still allowing multiple tests to possibly be conducted.
The efficacy analyses were conducted in the intention-to-treat population, which included 338 patients on the tremelimumab plus durvalumab plus chemotherapy arm, 338 patients on the durvalumab plus chemotherapy arm, and 337 patients on chemotherapy alone. The median follow-up among those without an event was 10.3 months for progression-free survival and 34.9 months for overall survival. The findings for the co-primary endpoints were that progression-free survival was significantly improved with durvalumab plus chemotherapy ver
10 min