The purpose of this study is to determine whether the combination of palbociclib with cetuximab is superior to cetuximab in prolonging overall survival in HPV-negative, cetuximab-naive patients with recurrent/metastatic squamous cell carcinoma of the head and neck.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
QUADRUPLE
Enrollment
125
Palbociclib will be supplied as capsules containing 75 mg, 100 mg, or 125 mg equivalents of palbociclib free base. Administered with food on Day 1 to Day 21 followed by 7 days off treatment in a 28-day cycle.
Cetuximab injection for IV infusion will be provided in 100 mg/50 mL, single-use vials, and 200 mg/100 mL, single-use vials. In Japan, cetuximab will be provided in 100 mg/20 mL, single-use vials. Administered, 400 mg/m2 initial dose as a 120-minute IV infusion followed by 250 mg/m2 weekly infused over 60 minutes.
Placebo for palbociclib will be indistinguishable from the palbociclib capsules and will be supplied as capsules matching in size and color the various palbociclib formulations. Administered with food on Day 1 to Day 21 followed by 7 days off treatment in a 28-day cycle.
Overall Survival (OS)
OS was defined as the time from the date of randomization to the date of death due to any cause. OS (in months) was calculated as (date of death - randomization date +1)/30.4. For participants lacking survival data beyond the date of their last follow-up, the OS time was censored on the last date they were known to be alive. Participants lacking survival data beyond randomization had their OS times be censored at randomization. Estimates of OS and its 95% confidence interval were determined using Kaplan-Meier method.
Time frame: Baseline up to primary completion date (PCD) (about 34 months)
Progression Free Survival (PFS)
PFS was defined as the time from the date of randomization to the date of the first documentation of objective progression of disease (PD) or death due to any cause, whichever was earlier. Estimates of the PFS curves from the Kaplan Meier method were presented.
Time frame: Baseline up to PCD (about 34 months)
Percentage of Participants With Objective Response (OR)
OR was defined as the overall complete response (CR) or partial response (PR) according to the Response Evaluation Criteria in Solid Tumors (RECIST) version 1.1. Objective response rate was defined as the proportion of participants with best overall response (BOR) of CR or PR relative to all randomized.
Time frame: Baseline up to PCD (about 34 months)
Percentage of Participants With Clinical Benefit Response (CBR)
CBR was defined as the overall CR, PR, or stable disease\>=24 weeks according to the RECIST version 1.1. Clinical benefit response rate was defined as the proportion of participants with CR, PR, or stable disease\>= 24 weeks relative to all randomized participants and randomized participants with measurable disease at baseline.
Time frame: Baseline up to PCD (about 34 months)
Duration of Response (DR)
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UC San Diego Medical Center - La Jolla (Thornton Hospital)
La Jolla, California, United States
UC San Diego Moores Cancer Center
La Jolla, California, United States
UC San Diego Medical Center- Hillcrest
San Diego, California, United States
University Medical Center, lnc.:DBA University of Louisville Hospital
Louisville, Kentucky, United States
Mayo Clinic
Rochester, Minnesota, United States
Siteman Cancer Center
City of Saint Peters, Missouri, United States
Siteman Cancer Center - West County
Creve Coeur, Missouri, United States
Barnes-Jewish Hospital
St Louis, Missouri, United States
Washington University School of Medicine, Siteman Cancer Center
St Louis, Missouri, United States
Siteman Cancer Center - South County
St Louis, Missouri, United States
...and 61 more locations
DR was defined as the time from the first documentation of objective tumor response (CR or PR) to the first documentation of disease progression or to death due to any cause, whichever occurred first. If tumor progression data included more than 1 date, the first date was used. DR was calculated as \[the date response ended (ie, date of PD or death) - first CR or PR date + 1\]/30.4.
Time frame: Baseline up to PCD (about 34 months)
Number of Participants With Treatment-Emergent Adverse Events(TEAEs)
AE was defined as any untoward medical occurrence in a clinical investigation participant administered a product or medical device, regardless of the causal relationship to study treatment. TEAEs were defined as AEs which occurred for the first time during the effective duration of treatment or AEs that increased in severity during treatment. Serious AEs (SAEs) were defined as any untoward medical occurrence at any dose that resulted in death; was life-threatening (immediate risk of death); required inpatient hospitalization or caused prolongation of existing hospitalization; resulted in persistent or significant disability/incapacity (substantial disruption of the ability to conduction normal life functions). AEs included SAEs and non-serious AEs. Causality to study treatment was determined by the investigator. Severity was graded according to National Cancer Institute (NCI) Common Terminology Criteria for Adverse Events (CTCAE) version 4.03.
Time frame: From the first dose through and including 28 calendar days after the last administration of the study treatment (up to 6.9 years)
Number of Participants With Laboratory Abnormalities
The hematology, chemistry and coagulation tests were included in the laboratory examination. Hematology evaluation included hemoglobin, platelets, white blood cell, absolute neutrophils, absolute lymphocytes. Chemistry evaluation included alanine aminotransferase (ALT), aspartate aminotransferase (AST), alkaline phosphatase, sodium, potassium, magnesium, chloride, total calcium, total bilirubin, blood urea nitrogen (BUN) or urea, creatinine, uric acid, glucose (non-fasted), albumin, phosphorus or phosphate and hemoglobin A1c (HbA1c). Coagulation evaluation included activated partial thromboplastin time/partial thromboplastin time, international normalized ratio (INR) or prothrombin time.
Time frame: From the Screening (Day -28) through and including 28 calendar days after the last administration of the study treatment (up to 7 years)
Change From Baseline in European Organization for Research and Treatment of Cancer Quality of Life Questionnaire-C30 (EORTC QLQ-C30)
The EORTC QLQ-C30 is a 30 item questionnaire composed of 5 multi-item functional subscales (physical, role, cognitive, emotional, and social functioning), 3 multi-item symptom scales (fatigue, nausea/vomiting, and pain), a global health/quality of life (QOL) subscale, and 6 single items assessing other cancer related symptoms (dyspnea, sleep disturbance, appetite, diarrhea, constipation, and the financial impact of cancer). The questionnaire employed twenty-eight 4 point Likert scales with responses from "not at all" to "very much" and two 7 point Likert scales for global health and overall QOL. For functional and global QOL scales, higher scores represented a better level of functioning and all scores were converted to a 0 to 100 scale. For symptom oriented scales, a higher score represented more severe symptoms, and all scores were converted to a 0-100 scale. Negative changes from baseline indicate deterioration in functioning / global QoL scales and improvement in symptom scales.
Time frame: Baseline up to PCD (about 34 months)
Change From Baseline in European Organization for Research and Treatment of Cancer Head and Neck Module35 (EORTC QLQ-H&N35)
The EORTC QLQ-H\&N35 is designed to be used together with the core QLQ-C30. The recall period for the items in the module was "the past week". Items hn1 to hn30 were scored on 4 point Likert type categorical scales ("not at all", "a little", "quite a bit", "very much"). Items hn31 to hn35 had a "no/yes" response format. The scores were transformed into 0 to 100 scales, with a high score implying a high level of symptoms.Negative changes from baseline indicate deterioration in functioning / global QoL scales and improvement in symptom scales.
Time frame: Baseline up to PCD (about 34 months)
Summary of PFS and OS for P16 Negative (%Positive Tumor Cells < 70%)
A central test was defined as the tumor tissue-based p16 IHC test performed at a central laboratory (Ventana). The analysis of concordance between HPV status as assessed by local or central laboratory included the number and percentage of participants with p16 detected or not detected at the central laboratory, given that all local testing must have been negative for HPV in order for the patient to be eligible for the study. Initial analysis of the p16 status was based on the conventional cutoff of 70% p16-positive tumor cells to call out cases that might be considered HPV-positive. P16 expression was scored as positive if strong and diffuse nuclear and cytoplasmic staining was present in at least 70% of the tumor cells.
Time frame: Screening
Summary of PFS and OS Based on Investigator Assessment by Rb Expression >= 1%
Rb expression in the palbociclib and cetuximab treatment group, the relationship of the biomarker (individually) with PFS and OS were explored using graphical methods such as box plots, at baseline. The tumors of participants were Rb-positive, which was defined by Rb IHC with\>=1% positive tumor cells.
Time frame: Screening
Trough Plasma Concentration (Ctrough) and Within-participant Mean Steady-state Pre-dose Concentration (WPM-Ctrough) at Steady State for Palbociblib
Ctrough is steady-state pre-dose concentration, which was observed directly from data. WPM-Ctrough is within-participant mean steady-state pre-dose concentration. For palbociclib, a steady-state trough was to be defined as a pre-dose plasma concentration following at least 7 consecutive days of 125 mg daily dose without dosing interruption and the time window for the PK collection was to be between 24 hr +/- 2 hr and 24 min post-dose the day prior to PK collection and no more than 1 hr post-dose on the day of PK collection.
Time frame: Pre-dose of Day 15 in Cycle 1 and Cycle 2
Ctrough and Cendinf, WPM-Ctrough and WPM-Cendinf at Steady State for Serum Cetuximab
Ctrough is steady-state pre-dose concentration. Cendinf is steady-state end-of-infusion concentration. Ctrough and Cendinf were observed directly from data. WPM-Ctrough and WPM-Cendinf are within-participant mean steady-state pre-dose concentration and end-of-infusion concentration. Acceptance criteria for a steady-state Cendinf was defined as a PK sample that was 1) collected after at least 3 consecutive weeks of cetuximab IV infusions without interruption or prior dose reduction and 2) was collected at the end of cetuximab infusion time +/- 10% of the actual duration of the cetuximab infusion.
Time frame: Pre-dose and end-of infusion of Day 15 in Cycle 1 and Cycle 2