A Study Of Oral Palbociclib (PD-0332991), A CDK4/6 Inhibitor, As Single Agent In Japanese Patients With Advanced Solid Tumors Or In Combination With Letrozole For The First-Line Treatment Of Postmenopausal Japanese Patients With ER (+) HER2 (-) Advanced Breast Cancer

A PHASE 1/2 STUDY OF THE EFFICACY, SAFETY, AND PHARMACOKINETICS OF ORAL PD-0332991, A CYCLIN-DEPENDENT KINASE 4 AND 6 (CDK4/6) INHIBITOR, AS SINGLE AGENT IN JAPANESE PATIENTS WITH ADVANCED SOLID TUMORS OR IN COMBINATION WITH LETROZOLE FOR THE FIRST-LINE TREATMENT OF POSTMENOPAUSAL JAPANESE PATIENTS WITH ER (+) HER2 (-) ADVANCED BREAST CANCER

This study is comprised of two portions: a Phase 1 portion and a Phase 2 portion. The Phase 1 portion is a single-country, non-randomized, open label, clinical trial which will evaluate the safety, tolerability, preliminary efficacy, and PK profile of PD-0332991 as a single agent in Japanese patients with advanced solid tumors, and PD-0332991 in combination with letrozole in the first-line treatment of Japanese patients with ER(+) HER2(-) ABC. The Phase 2 portion is a single-country, non-randomized, open-label, single-cohort, multi-center clinical trial to evaluate the efficacy and safety of PD-0332991 in combination with letrozole for the first-line treatment of postmenopausal Japanese patients with ER(+) HER2(-) ABC.

Study Overview

• Status: Completed
• Conditions: Neoplasms; Breast Neoplasms
• Intervention / Treatment: Drug: PD-0332991; Drug: PD-0332991; Drug: letrozole

• Study Type: Interventional
• Enrollment (Actual): 61
• Phase: Phase 2

Contacts and Locations

Study Locations

• Japan
  • Chiba, Japan, 260-8717
    • Chiba Cancer Center
  • Ehime, Japan, 791-0280
    • National Hospital Organization Shikoku Cancer Center
  • Fukuoka, Japan, 811-1395
    • National Hospital Organization Kyushu Cancer Center
  • Hiroshima, Japan, 730-8518
    • Hiroshima City Hiroshima Citizens Hospital
  • Iwate, Japan, 020-8505
    • Iwate Medical University Hospital
  • Kagoshima, Japan, 892-0833
    • Hakuaikai Medical Corporation Sagara Hospital
  • Kumamoto, Japan, 860-8556
    • Kumamoto University Hospital
  • Kumamoto, Japan, 862-8505
    • Kumamoto City Hospital
  • Kyoto, Japan, 606-8507
    • Kyoto University Hospital
  • Osaka, Japan, 540-0006
    • National Hospital Organization Osaka National Hospital
  • Aichi
    • Nagoya, Aichi, Japan, 464-8681
      • Aichi Cancer Center Hospital
  • Chiba
    • Kashiwa, Chiba, Japan, 277-8577
      • National Cancer Center Hospital East
  • Hokkaido
    • Sapporo, Hokkaido, Japan, 003-0804
      • National Hospital Organization Hokkaido Cancer Center
  • Kumamoto
    • Kumamoto-city, Kumamoto, Japan, 862-8655
      • Kumamoto Shinto General Hospital
  • Saitama
    • Kita-adachi-gun, Saitama, Japan, 362-0806
      • Saitama Cancer Center
  • Tokyo
    • Chuo-Ku, Tokyo, Japan, 104-0045
      • National Cancer Center Hospital

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 20 years and older (ADULT, OLDER_ADULT)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

Description

Inclusion Criteria:

Phase 1

• In Part 1, advanced solid tumor (except SCLC or retinoblastoma) proven histologically or cytologically at original diagnosis, that is refractory to standard therapy or for whom no standard of care therapy is available.
• In Part 2 and Phase 2, post menopausal women with proven diagnosis of ER-positive, HER2-negative adenocarcinoma of the breast with evidence of locoregionally recurrent or metastatic disease (including bone only disease) not amenable to resection or radiation therapy with curative intent and for whom chemotherapy is not clinically indicated.
• Adequate blood cell counts, kidney function and liver function and and Eastern Cooperative Oncology Group [ECOG] score of 0 or 1.
• Resolved acute effects of any prior therapy to baseline severity or Grade ≤1

Phase 2

• Adult women (≥ 20 years of age) with proven diagnosis of adenocarcinoma of the breast with evidence of locoregionally recurrent or metastatic disease not amenable to resection or radiation therapy with curative intent and for whom chemotherapy is not clinically indicated.
• Documentation of histologically or cytologically confirmed diagnosis of ER(+) breast cancer based on local laboratory results.
• Adequate blood cell counts, kidney function and liver function and and Eastern Cooperative Oncology Group [ECOG] score of 0 to 2.

Exclusion Criteria:

Phase 1

• Active uncontrolled or symptomatic CNS metastases.
• Uncontrolled infection, unstable or sever intercurrent medical condition, or current drug or alcohol abuse
• Active or unstable cardiac disease or history of heart attack within 6 months

Phase 2

• HER2 positive tumor based on local laboratory results utilizing one of the sponsor approved assays.
• Known active uncontrolled or symptomatic CNS metastases, carcinomatous meningitis, or leptomeningeal disease.
• Prior neoadjuvant or adjuvant treatment with a non steroidal aromatase inhibitor (ie, anastrozole or letrozole) with disease recurrence while on or within 12 months of completing treatment.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: TREATMENT
• Allocation: NON_RANDOMIZED
• Masking: NONE

Number of Arms

3

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
EXPERIMENTAL: Single-agent PD-0332991; Phase 1 Part 1	Drug: PD-0332991; PD-0332991 (100 mg or 125 mg) will be orally administered once a day for 3 weeks followed by 1 week off treatment, in the morning on an empty stomach. Dose reduction of PD-0332991 by one (100 mg) or two (75 mg) dose level is permitted depending on treatment related toxicity.; Drug: PD-0332991; PD-0332991, 125 mg, will be orally administered with food once a day for 3 weeks followed by 1 week off treatment. PD-0332991 will be administered once a day together with letrozole. Dose reduction of PD-0332991 by one (100 mg) or two (75 mg) dose level is permitted depending on treatment related toxicity.
EXPERIMENTAL: PD-0332991 in combination with letrozole; Phase 1 Part 2	Drug: PD-0332991; PD-0332991 (100 mg or 125 mg) will be orally administered once a day for 3 weeks followed by 1 week off treatment, in the morning on an empty stomach. Dose reduction of PD-0332991 by one (100 mg) or two (75 mg) dose level is permitted depending on treatment related toxicity.; Drug: PD-0332991; PD-0332991, 125 mg, will be orally administered with food once a day for 3 weeks followed by 1 week off treatment. PD-0332991 will be administered once a day together with letrozole. Dose reduction of PD-0332991 by one (100 mg) or two (75 mg) dose level is permitted depending on treatment related toxicity.; Drug: letrozole; Letrozole, 2.5 mg, will be orally administered once a day in continuous daily dosing together with PD-0332991. Dose reduction of letrozole is not permitted, but dosing interruptions for letrozole-related toxicity are allowed as per investigator's medical judgement.
EXPERIMENTAL: PD-0332991 with letrozole; Phase 2	Drug: PD-0332991; PD-0332991 (100 mg or 125 mg) will be orally administered once a day for 3 weeks followed by 1 week off treatment, in the morning on an empty stomach. Dose reduction of PD-0332991 by one (100 mg) or two (75 mg) dose level is permitted depending on treatment related toxicity.; Drug: PD-0332991; PD-0332991, 125 mg, will be orally administered with food once a day for 3 weeks followed by 1 week off treatment. PD-0332991 will be administered once a day together with letrozole. Dose reduction of PD-0332991 by one (100 mg) or two (75 mg) dose level is permitted depending on treatment related toxicity.; Drug: letrozole; Letrozole, 2.5 mg, will be orally administered once a day in continuous daily dosing together with PD-0332991. Dose reduction of letrozole is not permitted, but dosing interruptions for letrozole-related toxicity are allowed as per investigator's medical judgement.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Number of Participants With Dose Limiting Toxicities (DLT): Part 1 Phase 1	DLT was classified as per common terminology criteria for adverse events (CTCAE) version 4.0 as any of the events occurring during 28 days of Cycle 1,attributed to study drug:grade 4 neutropenia(for a duration of greater than [>]7 days); febrile neutropenia (grade greater than or equal to [>=]3 neutropenia,body temperature >=38.5 degree Celsius);grade >=3 thrombocytopenia with bleeding episode;grade 4 thrombocytopenia;grade >=3 non-hematologic toxicity except grade 3 or more nausea, vomiting,electrolyte abnormality(if controllable by therapy);grade 3 QTc prolongation(>500 millisecond [msec])persist after correction of reversible cause such as electrolyte abnormalities or hypoxia. Lack of hematologic recovery (platelets less than [<]50,000/microliter [mcL],absolute neutrophil count <1,000/mcL,hemoglobin <8.0 gram/deciliter [g/dL]) or prolonged non hematologic toxicities that delays initiation of next dose by >7 days;receipt of <75 percent of planned dose in first cycle due to toxicity.	Lead-in period (Day -7) up to Day 28 (Cycle 1)
Number of Participants With Treatment-Related Adverse Events (AEs) and Serious Adverse Events (SAEs): Part 2 Phase 1	A treatment related AE is any untoward medical occurrence in a clinical investigation participant administered a product or medical device; the event had a causal relationship with the treatment or usage. A SAE was an AE resulting in any of the following outcomes or deemed significant for any other reason: death; initial or prolonged inpatient hospitalization; life-threatening experience (immediate risk of dying); persistent or significant disability/incapacity; congenital anomaly. Relatedness was judged by investigator. AEs included both serious and non-serious adverse events.	Baseline (Day 1) up to 28 days after last dose of study drug (up to 1673 days)
Number of Participants With Treatment-Emergent Adverse Events (TEAEs) By Severity: Part 2 Phase 1	AE was any untoward medical occurrence in a participant who received study drug without regard to possibility of causal relationship. An AE was considered treatment emergent if occurred for the first time after the start of study treatment or occurred prior to the start of treatment but increased in National Cancer Institute (NCI) CTCAE grade during study treatment period. AE severity was defined to be the maximum toxicity grade of the TEAEs experienced by the participants during the study. AE was assessed according to severity as: Grade 1 (mild AE), Grade 2 (moderate AE), Grade 3 (severe AE), Grade 4 (life-threatening consequences) and Grade 5 (death related to AE).	Baseline (Day 1) up to 28 days after last dose of study drug (up to 1673 days)
Percentage of Participants With 1 Year Progression Free Survival (PFS): Phase 2	PFS was defined as the time from first dose of study treatment to the date of the first documentation of objective progression of disease (PD) or death due to any cause in the absence of documented PD, whichever occurred first. PD was defined using Response Evaluation Criteria In Solid Tumors Criteria (RECIST v1.1), as a 20% increase in the sum of the longest diameter of target lesions, or a measurable increase in a non-target lesion, or the appearance of new lesions.1-year PFS was defined as the percentage of participants without PFS events (PD or death due to any cause) at 12 months based on the Kaplan-Meier estimate. Percentage of participants with 1-year PFS with 90% confidence interval (CI) were reported.	From initiation of treatment up to 12 months

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Number of Participants With Treatment-Related Adverse Events (AEs) and Serious Adverse Events (SAEs): Phase 1 (Part 1) and Phase 2	A treatment related AE is any untoward medical occurrence in a clinical investigation participant administered a product or medical device; the event had a causal relationship with the treatment or usage. A SAE was an AE resulting in any of the following outcomes or deemed significant for any other reason: death; initial or prolonged inpatient hospitalization; life-threatening experience (immediate risk of dying); persistent or significant disability/incapacity; congenital anomaly. Relatedness was judged by investigator. AEs included both serious and non-serious adverse events.	Part 1 Phase 1: Lead-in period (Day -7) up to 28 days after last dose of study drug (up to 308 days), Phase 2: Baseline (Day 1) up to 28 days after last dose of study drug (up to 1526 days)
Number of Participants With Treatment-Emergent Adverse Events (AEs) By Severity: Phase 1 (Part 1) and Phase 2	AE was any untoward medical occurrence in a participant who received study drug without regard to possibility of causal relationship. An AE was considered treatment emergent if occurred for the first time after the start of study treatment or occurred prior to the start of treatment but increased in NCI CTCAE version 4.0 grade during study treatment period. AE severity was defined to be the maximum toxicity grade of the TEAEs experienced by the participants during the study. AE was assessed according to severity as: Grade 1 (mild AE), Grade 2 (moderate AE), Grade 3 (severe AE), Grade 4 (life-threatening consequences) and Grade 5 (death related to AE).	Part 1 Phase 1: Lead-in period (Day -7) up to 28 days after last dose of study drug (up to 308 days), Phase 2: Baseline (Day 1) up to 28 days after last dose of study drug (up to 1526 days)
Number of Participants With Clinically Significant Laboratory Abnormalities	Abnormality criteria: hemoglobin: <0.8*lower limit of normal [LLN], platelets: <0.5*LLN or >1.75*upper limit of normal [ULN], leukocytes: <0.6*LLN or >1.5*ULN, lymphocytes, total neutrophils: <0.8*LLN or >1.2*ULN, basophils, eosinophil,monocytes: >1.2*ULN); aspartate aminotransferase, alanine aminotransferase, alkaline phosphatase, gamma glutamyl transferase (GT): >0.3*ULN, total protein, albumin: <0.8*LLN or >1.2*ULN, total bilirubin, direct bilirubin: >1.5*ULN; blood urea nitrogen, creatinine: >1.3*ULN, uric acid: >1.2*ULN; sodium: <0.95*LLN or >1.05*ULN, potassium, chloride, calcium, magnesium: <0.9*LLN or >1.1*ULN, phosphate: <0.8*LLN or >1.2*ULN; creatine kinase: >2.0*ULN, glucose fasting: <0.6*LLN or >1.5*ULN, glycosylated haemoglobin: >1.3*ULN;urinalysis dipstick (urine protein, urine blood >=1); urine protein 24 hour: >1.1*ULN; coagulation Activated partial thromboplastin time [APTT], Prothrombin, prothrombin international ratio: >1.1*ULN.	Part 1 Phase 1: Lead-in period (Day -7) up to 308 days; Part 2 Phase 1: Baseline (Day 1) up to 1673 days; Phase 2: Baseline (Day 1) up to 1526 days
Area Under the Plasma Concentration Time Curve Over Dosing Interval (AUCtau) of PD-0332991 Following Multiple Dose: Part 1 Phase 1	AUCtau is area under the plasma concentration-time curve over dosing interval which is calculated by log-linear trapezoidal method.	Multiple dose: 0 hour (pre-dose), 1, 2, 4, 6, 8, 12, 24 hours post-dose on Cycle 1 Day 8
AUCtau Dose Normalized to 125 Milligram (mg) of PD-0332991 Following Multiple Dose: Part 1 Phase 1	AUCtau Dose Normalized to 125 mg is area under the plasma concentration-time curve over dosing interval dose normalized to 125 mg which is calculated by log-linear trapezoidal method.	Multiple dose: 0 hour (pre-dose), 1, 2, 4, 6, 8, 12, 24 hours post-dose on Cycle 1 Day 8
Area Under the Plasma Concentration-Time Curve From 0 to Time 24 Hours (AUC24) of PD-0332991 Following Single Dose: Part 1 Phase 1	AUC24 is area under the plasma concentration-time curve from 0 to time 24 hours which is calculated by log-linear trapezoidal method.	Single dose: 0 hour (pre-dose), 1, 2, 4, 6, 8, 12 and 24 hours post-dose in Lead-in period (Day -7)
AUC24 Dose Normalized to 125 mg of PD-0332991 Following Single Dose: Part 1 Phase 1	AUC24 Dose Normalized to 125 mg is area under the plasma concentration-time curve from 0 to time 24 hours dose normalized to 125 mg which is calculated by log-linear trapezoidal method.	Single dose: 0 hour (pre-dose), 1, 2, 4, 6, 8, 12 and 24 hours post-dose in Lead-in period (Day -7)
Area Under the Plasma Concentration-Time Curve From Time Zero to Infinity (AUCinf) of PD-0332991 Following Single Dose: Part 1 Phase 1	AUCinf is area under the plasma concentration-time curve from 0 to infinity which is calculated by log-linear trapezoidal method.	Single dose: 0 hour (pre-dose), 1, 2, 4, 6, 8, 12, 24, 48, 72, 96, 120 hours post-dose in Lead-in period (Day -7)
AUCinf Dose Normalized to 125 mg of PD-0332991 Following Single Dose: Part 1 Phase 1	AUCinf Dose Normalized to 125 mg is area under the plasma concentration-time curve from 0 to infinity dose normalized to 125 mg which is calculated by log-linear trapezoidal method.	Single dose: 0 hour (pre-dose), 1, 2, 4, 6, 8, 12, 24, 48, 72, 96, 120 hours post-dose in Lead-in period (Day -7)
Area Under the Plasma Concentration-Time Curve From 0 to Time of Last Measurable Concentration (AUClast) of PD-0332991 Following Single Dose: Part 1 Phase 1	AUClast is area under the plasma concentration-time curve from 0 to time of last measurable concentration which is calculated by log-linear trapezoidal method.	Single dose: 0 hour (pre-dose), 1, 2, 4, 6, 8, 12, 24, 48, 72, 96, 120 hours post-dose in Lead-in period (Day -7)
AUClast Dose Normalized to 125 mg of PD-0332991 Following Single Dose: Part 1 Phase 1	AUClast Dose Normalized to 125 mg is area under the plasma concentration-time curve from 0 to time of last measurable concentration dose normalized to 125 mg which is calculated by log-linear trapezoidal method.	Single dose: 0 hour (pre-dose), 1, 2, 4, 6, 8, 12, 24, 48, 72, 96, 120 hours post-dose in Lead-in period (Day -7)
Apparent Oral Clearance of PD-0332991: Part 1 Phase 1	Clearance of a drug is a measure of the rate at which a drug is metabolized or eliminated by normal biological processes. It was calculated by dividing the given oral dose by AUCinf. AUCinf is area under the plasma concentration-time curve from 0 to infinity which is calculated by log-linear trapezoidal method.	Single dose: 0 hour (pre-dose),1, 2, 4, 6, 8, 12, 24, 48, 72, 96, 120 hours post-dose in Lead-in period (Day -7), Multiple dose: 0 hour (pre-dose), 1, 2, 4, 6, 8, 12, 24 hours post-dose on Cycle 1 Day 8
Maximum Observed Plasma Concentration (Cmax) Of PD-0332991: Part 1 Phase 1	Cmax is maximum plasma concentration which is observed directly from the actual time-concentration data.	Single dose: 0 hour (pre-dose),1, 2, 4, 6, 8, 12, 24, 48, 72, 96, 120 hours post-dose in Lead-in period (Day -7), Multiple dose: 0 hour (pre-dose), 1, 2, 4, 6, 8, 12, 24 hours post-dose on Cycle 1 Day 8
Cmax Dose Normalized to 125 mg of PD-0332991: Part 1 Phase 1	Cmax Dose Normalized to 125 mg is maximum plasma concentration dose normalized to 125 mg which is observed directly from the actual time-concentration data.	Single dose: 0 hour (pre-dose),1, 2, 4, 6, 8, 12, 24, 48, 72, 96, 120 hours post-dose in Lead-in period (Day -7), Multiple dose: 0 hour (pre-dose), 1, 2, 4, 6, 8, 12, 24 hours post-dose on Cycle 1 Day 8
Pre-dose Plasma Concentration (Ctrough) of PD-0332991 Following Multiple Dose: Part 1 Phase 1	Ctrough is pre-dose concentration during multiple dosing which is observed directly from the actual time-concentration data.	Multiple dose: 0 hour (pre-dose), 1, 2, 4, 6, 8, 12, 24 hours post-dose on Cycle 1 Day 8
Accumulation Ratio (Rac) of PD-0332991 Following Multiple Dose: Part 1 Phase 1	Rac is the ratio of AUCtau (after multiple doses) to AUCtau (after single dose). AUCtau is area under the plasma concentration-time curve over dosing interval which is calculated by log-linear trapezoidal method.	Single dose: 0 hour (pre-dose), 1, 2, 4, 6, 8, 12, 24, 48, 72, 96, 120 hours post-dose in Lead-in period (Day -7), Multiple dose: 0 hour (pre-dose), 1, 2, 4, 6, 8, 12, 24 hours post-dose on Cycle 1 Day 8
Linearity (Rss) of PD-0332991 Following Multiple Dose: Part 1 Phase 1	Rss is the ratio of AUCtau (after multiple doses) to AUCinf (after single dose). AUCtau is area under the plasma concentration-time curve over dosing interval which is calculated by log-linear trapezoidal method. AUCinf is area under the plasma concentration-time curve from 0 to infinity which is calculated by log-linear trapezoidal method.	Single dose: 0 hour (pre-dose), 1, 2, 4, 6, 8, 12, 24, 48, 72, 96, 120 hours post-dose in Lead-in period (Day -7), Multiple dose: 0 hour (pre-dose), 1, 2, 4, 6, 8, 12, 24 hours post-dose on Cycle 1 Day 8
Time to Reach Maximum Observed Plasma Concentration (Tmax) of PD-0332991: Part 1 Phase 1	Tmax is time at which maximum plasma concentration (Cmax) was observed. It was observed directly from data as time of first occurrence.	Single dose: 0 hour (pre-dose),1, 2, 4, 6, 8, 12, 24, 48, 72, 96, 120 hours post-dose in Lead-in period (Day -7), Multiple dose: 0 hour (pre-dose), 1, 2, 4, 6, 8, 12, 24 hours post-dose on Cycle 1 Day 8
Terminal Half-Life (t1/2) of PD-0332991: Part 1 Phase 1	t1/2 is terminal elimination half-life which is calculated by loge(2)/kel, where kel is the terminal phase rate constant calculated by a linear regression of the log-linear concentration-time curve.	Single dose: 0 hour (pre-dose),1, 2, 4, 6, 8, 12, 24, 48, 72, 96, 120 hours post-dose in Lead-in period (Day -7), Multiple dose: 0 hour (pre-dose), 1, 2, 4, 6, 8, 12, 24 hours post-dose on Cycle 1 Day 8
Volume of Distribution (Vz/F) of PD-0332991 Following Single Dose: Part 1 Phase 1	Vz/F is apparent volume of distribution estimated from terminal phase, which is calculated as CL/F/kel. Clearance of a drug is a measure of the rate at which a drug is metabolized or eliminated by normal biological processes. It was calculated by dividing the given oral dose by area under the plasma concentration-time curve from 0 to infinity which is calculated by log-linear trapezoidal method (AUCinf). kel is the terminal phase rate constant calculated by a linear regression of the log-linear concentration-time curve.	Single dose: 0 hour (pre-dose), 1, 2, 4, 6, 8, 12, 24, 48, 72, 96, 120 hours post-dose in Lead-in period (Day -7)
Area Under the Plasma Concentration Time Curve Over Dosing Interval (AUCtau) of PD-0332991: Phase 2	AUCtau is area under the plasma concentration-time curve over dosing interval which is calculated by log-linear trapezoidal method.	0 (pre-dose), 1, 2, 4, 6, 8, 10, 24 hours post dose on Cycle 1 Day 15
Apparent Oral Clearance of PD-0332991: Phase 2	Clearance of a drug is a measure of the rate at which a drug is metabolized or eliminated by normal biological processes. It was calculated by dividing the given oral dose by AUCtau. AUCtau is the area under the plasma concentration-time curve over dosing interval which is calculated by log-linear trapezoidal method.	0 (pre-dose), 1, 2, 4, 6, 8, 10, 24 hours post dose on Cycle 1 Day 15
Maximum Observed Plasma Concentration (Cmax) Of PD-0332991: Phase 2	Cmax is maximum plasma concentration which is observed directly from the actual time-concentration data.	0 (pre-dose), 1, 2, 4, 6, 8, 10, 24 hours post dose on Cycle 1 Day 15
Time to Reach Maximum Observed Plasma Concentration (Tmax) of PD-0332991: Phase 2	Tmax is time at which maximum plasma concentration (Cmax) was observed. It was observed directly from data as time of first occurrence.	0 (pre-dose), 1, 2, 4, 6, 8, 10, 24 hours post dose on Cycle 1 Day 15
Pre-dose Plasma Concentration (Ctrough) of PD-0332991: Phase 2	Ctrough is pre-dose concentration during multiple dosing which is observed directly from the actual time-concentration data.	0 (pre-dose), 1, 2, 4, 6, 8, 10, 24 hours post dose on Cycle 1 Day 15
Percentage of Participants With Objective Response: Phase 1	Objective response (OR) was defined as a complete response (CR) or partial response (PR) according to the RECIST version 1.1 recorded from first dose of study treatment until disease progression or death due to any cause. CR was defined as disappearance of all target lesions with the exception of nodal disease. All target nodes reduced to normal size (short axis <10 millimeter [mm]). PR was defined as a >=30 percent decrease in sum of the longest dimensions of the target lesions taking as a reference the baseline sum longest dimensions. Percentage of participants with objective response (who achieved CR or PR) were reported.	From initiation of treatment up to disease progression (up to 30 months)
Percentage of Participants With Objective Response: Phase 2	Objective response was defined as a complete response (CR) or partial response (PR) according to the RECIST version 1.1 recorded from first dose of study treatment until disease progression or death due to any cause. PD was defined using RECIST v1.1, as a 20% increase in the sum of the longest diameter of target lesions, or a measurable increase in a non-target lesion, or the appearance of new lesions. CR was defined as disappearance of all target lesions with the exception of nodal disease. All target nodes reduced to normal size (short axis <10 mm). PR was defined as a >=30% decrease in sum of the longest dimensions of the target lesions taking as a reference the baseline sum longest dimensions. Percentage of participants with objective response (who achieved CR or PR) were reported.	From initiation of treatment up to disease progression (up to 1526 days)
Duration of Response (DOR): Part 2 Phase 1	Duration of response was defined as the interval from the first documentation of objective tumor response in participants with CR (disappearance of all target lesions with the exception of nodal disease. All target nodes reduced to normal size (short axis <10 millimeter [mm]) or PR (a >=30 percent decrease in sum of the longest dimensions of the target lesions taking as a reference the baseline sum longest dimensions) according to RECIST version 1.1 to the first documentation of objective tumor progression or to death due to any cause, whichever occurred first.	baseline up to 1673 days
Duration of Response (DOR): Phase 2	Duration of response was defined as the interval from the first documentation of objective tumor response in participants with CR (disappearance of all target lesions with the exception of nodal disease, all target nodes reduced to normal size (short axis <10 mm) or PR (a >=30 % decrease in sum of the longest dimensions of the target lesions taking as a reference the baseline sum longest dimensions) according to RECIST version 1.1 to the first documentation of objective tumor progression or to death due to any cause, whichever occurred first. PD was defined using RECIST v1.1, as a 20% increase in the sum of the longest diameter of target lesions, or a measurable increase in a non-target lesion, or the appearance of new lesions.	From initiation of treatment up to disease progression (up to 1526 days)
Progression Free Survival (PFS): Part 2 Phase 1	PFS was defined as the time from first dose of study treatment to the date of the first documentation of objective progression of disease (PD) or death due to any cause in the absence of documented PD, whichever occurs first. PD was defined using Response Evaluation Criteria In Solid Tumors Criteria (RECIST v1.1), as a 20% increase in the sum of the longest diameter of target lesions, or a measurable increase in a non-target lesion, or the appearance of new lesions.	baseline up to 1673 days
Percentage of Participants With Disease Control (DC): Phase 2	DC: CR, PR or stable disease (SD) for >=24 weeks according to RECIST version (v)1.1 recorded in time period between first dose of study treatment and disease progression or death to any cause. CR: disappearance of all target lesions with exception of nodal disease. All target nodes reduced to normal size (short axis <10 mm). PR: >=30% decrease in sum of longest dimensions of target lesions taking as a reference baseline sum longest dimensions. SD was defined as not achieving an OR with confirmed CR or PR according to RECIST v1.1, as determined by investigators, relative to response evaluable population, but remained stable for at least 24 weeks after first dose, then best overall response for such a participant was considered as stable disease. PD was defined using RECIST v1.1 as a 20% increase in sum of longest diameter of target lesions, or a measurable increase in a non-target lesion, or appearance of new lesions.	From initiation of treatment up to disease progression (up to 1526 days)
Overall Survival (OS): Phase 2	Overall survival was defined as the time from first dose of study treatment to date of death due to any cause. In the absence of confirmation of death, survival time was censored to last date the participant was known to be alive. OS was estimated with Kaplan-Meier method.	From initiation of treatment up to follow-up period (up to 1526 days)
Change From Baseline in Functional Assessment of Cancer Therapy-Breast Cancer (FACT-B): Phase 2 at Day 1 of Cycle 2, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49 and End of Treatment	The functional assessment of cancer therapy (FACT) is a modular approach to assess participant's health-related quality of life. FACT-B total score was derived from the sum of these 5 sub-scale scores: physical well-being, social/family well-being and functional well-being (all 3 sub-scales consisting of 7 items ranging from 0 to 28, where higher scores indicating better quality of life), emotional well-being (consists of 6 items and ranging from 0 to 24, where higher scores indicating better quality of life, and a breast cancer subscale (consists of 9 items and ranging from 0 to 36, where higher scores indicating better quality of life). Each individual item was rated on a 5-point Likert scale, ranging from 0 (not at all good) to 4 (very well), where higher scores indicating better quality of life. FACT-B total score range was of 0 (not at all good) to 144 (very well), where higher scores indicating better quality of life.	Baseline (Day 1 of Cycle 1), Day 1 of Cycle 2, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, End of treatment (up to 1526 days)
Change From Baseline in Functional Assessment of Cancer Therapy-General (FACT-G): Phase 2 at Day 1 of Cycle 2, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49 and End of Treatment	FACT is a modular approach to assess participant's health-related quality of life. FACT-G total score was derived from the sum of these 4 sub-scale scores: physical well-being, social/family well-being and functional well-being (all 3 sub-scales consisting of 7 items ranging from 0 to 28, where higher scores indicating better quality of life), emotional well-being (consists of 6 items and ranging from 0 to 24, where higher scores indicating better quality of life). Each individual item was rated on a 5-point Likert scale, ranging from 0 (not at all good) to 4 (very well), where higher scores indicating better quality of life. FACT-G total score range was of 0 (not at all good) to 108 (very well), where higher scores indicating better quality of life.	Baseline (Day 1 of Cycle 1), Day 1 of Cycle 2, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, End of treatment (up to 1526 days)
Change From Baseline in Trial Outcome Index (TOI): Phase 2 at Day 1 of Cycle 2, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49 and End of Treatment	FACT is a modular approach to assess participant's health-related quality of life. TOI total score was derived from the sum of the 3 sub-scale scores: physical well-being, functional well-being (both sub-scales consisting of 7 items ranging from 0 to 28, where higher scores indicating better quality of life) and breast cancer subscale (consists of 9 items and ranging from 0 to 36, where higher scores indicating better quality of life). Each individual item was rated on a 5-point Likert scale, ranging from 0 (not at all good) to 4 (very well), where higher scores indicating better quality of life. TOI total score range was of 0 (not at all good) to 92 (very well), where higher scores indicating better quality of life.	Baseline (Day 1 of Cycle 1), Day 1 of Cycle 2, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, End of treatment (up to 1526 days)
Presence of Tumor Tissue Biomarker- Ki67: Phase 2	Tumor tissue biomarker, Ki67 was analyzed to investigate possible associations with resistance or sensitivity to treatment with study drugs and was selected based on its known relevance to mechanisms involved in cell cycle regulation. Number of participants with less than or equal to and greater than 20 percent of Ki67 tumor tissue biomarker were reported.	Baseline (Day 1)
Presence of Tumor Tissue Biomarkers- Estrogen Receptor (ER) H-Score, Retinoblastoma (Rb) H-Score, B-cell Lymphoma-1 (BCL-1) H-Score, P16 H-Score: Phase 2	Tumor tissue biomarkers ER, Rb, BCL-1 and P16 were analyzed to investigate possible associations with resistance or sensitivity to treatment with study drugs and were selected based on their known relevance to mechanisms involved in cell cycle regulation. Number of participants with positive ER (H-Score), Rb (H-Score), BCL-1 (H-Score) and P16 (H-Score) tumor tissue biomarkers were reported. The H-score is a method of assessing the extent of nuclear immunoreactivity, applicable to steroid receptors.	Baseline (Day 1)

Collaborators and Investigators

• Sponsor: Pfizer

Publications and helpful links

General Publications

• Takahashi M, Masuda N, Nishimura R, Inoue K, Ohno S, Iwata H, Hashigaki S, Muramatsu Y, Umeyama Y, Toi M. Palbociclib-letrozole as first-line treatment for advanced breast cancer: Updated results from a Japanese phase 2 study. Cancer Med. 2020 Jul;9(14):4929-4940. doi: 10.1002/cam4.3091. Epub 2020 May 18.
• Masuda N, Mukai H, Inoue K, Rai Y, Ohno S, Mori Y, Hashigaki S, Muramatsu Y, Umeyama Y, Iwata H, Toi M. Neutropenia management with palbociclib in Japanese patients with advanced breast cancer. Breast Cancer. 2019 Sep;26(5):637-650. doi: 10.1007/s12282-019-00970-7. Epub 2019 May 24. Erratum In: Breast Cancer. 2019 Jun 5;:
• Tamura K, Mukai H, Naito Y, Yonemori K, Kodaira M, Tanabe Y, Yamamoto N, Osera S, Sasaki M, Mori Y, Hashigaki S, Nagasawa T, Umeyama Y, Yoshino T. Phase I study of palbociclib, a cyclin-dependent kinase 4/6 inhibitor, in Japanese patients. Cancer Sci. 2016 Jun;107(6):755-63. doi: 10.1111/cas.12932. Epub 2016 May 11.

Helpful Links

• To obtain contact information for a study center near you, click here.

Study record dates

Study Major Dates

• Study Start (ACTUAL): October 19, 2012
• Primary Completion (ACTUAL): March 4, 2016
• Study Completion (ACTUAL): October 25, 2018

Study Registration Dates

• First Submitted: September 10, 2012
• First Submitted That Met QC Criteria: September 10, 2012
• First Posted (ESTIMATE): September 12, 2012

Study Record Updates

• Last Update Posted (ACTUAL): November 23, 2020
• Last Update Submitted That Met QC Criteria: October 28, 2020
• Last Verified: October 1, 2020

More Information

Terms related to this study

• Keywords: breast cancer; Japanese; solid tumors; Phase 1/2; PD-0332991; palbociclib; Cyclin Dependent Kinase 4/6 inhibitor; A5481010
• Additional Relevant MeSH Terms: Skin Diseases; Neoplasms by Site; Breast Diseases; Neoplasms; Breast Neoplasms; Physiological Effects of Drugs; Molecular Mechanisms of Pharmacological Action; Enzyme Inhibitors; Antineoplastic Agents; Hormones, Hormone Substitutes, and Hormone Antagonists; Protein Kinase Inhibitors; Hormone Antagonists; Aromatase Inhibitors; Steroid Synthesis Inhibitors; Estrogen Antagonists; Letrozole; Palbociclib
• Other Study ID Numbers: A5481010

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: YES
• IPD Plan Description: Pfizer will provide access to individual de-identified participant data and related study documents (e.g. protocol, Statistical Analysis Plan (SAP), Clinical Study Report (CSR)) upon request from qualified researchers, and subject to certain criteria, conditions, and exceptions. Further details on Pfizer's data sharing criteria and process for requesting access can be found at: https://www.pfizer.com/science/clinical_trials/trial_data_and_results/data_requests.