Clinical Trials /

Palbociclib and Cetuximab in Metastatic Colorectal Cancer



This research study is designed to provide a better understanding of study drugs cetuximab (Erbitux®) and palbociclib when used in combination to treat patients with metastatic colon cancer.

Related Conditions:
  • Colorectal Carcinoma
Recruiting Status:



Phase 2

Trial Eligibility



  • Brief Title: Palbociclib and Cetuximab in Metastatic Colorectal Cancer
  • Official Title: Phase II Single-arm Study of the Combination of Palbociclib and Cetuximab in KRAS/NRAS/BRAF Wild-type Metastatic Colorectal Cancer

Clinical Trial IDs

  • NCT ID: NCT03446157


  • Cancer of the Colon
  • Colon Cancer
  • Colon Neoplasms
  • Colonic Cancer
  • Neoplasms, Colonic


CetuximabErbituxOpen-label, single arm, Phase II
PalbociclibIbranceOpen-label, single arm, Phase II


This research study is designed to provide a better understanding of study drugs cetuximab (Erbitux®) and palbociclib when used in combination to treat patients with metastatic colon cancer.

Detailed Description

      This research study is designed to provide a better understanding of study drugs cetuximab
      (Erbitux®) and palbociclib when used in combination to treat patients with metastatic colon

      Cetuximab (Erbitux®) is an antibody designed to target a protein called Epidermal Growth
      Factor Receptor (EGFR). EGFR plays an important role in the growth and survival of colon
      cancer. Antibodies are proteins that are naturally produced by the immune system and
      circulate throughout your body to help protect you from disease caused by bacteria, viruses,
      cancer cells or any foreign or toxic substance. Antibodies work by sticking to and flagging
      or marking foreign cells or substances so that your body's immune defense system will
      recognize, attack and remove them. Antibodies help the body rid itself of disease. Antibodies
      can also be designed in the laboratory to stick to specific parts of cancer cells (or normal
      cells) to change or block the ways those cells function in your body and to produce a
      therapeutic anti-cancer effect. Cetuximab (Erbitux®) is an antibody drug approved by the FDA
      and is commonly used to treat your type of colon cancer.

      Palbociclib is an FDA-approved drug for patients with breast cancer. Palbociclib is not
      FDA-approved for the treatment of colon cancer, and is considered an investigational drug in
      this research study. Palbociclib targets a protein called CDK4/6 that is a critical part of
      the cell division and cell growth processes known as "the cell cycle". Laboratory studies
      have shown that palbociclib inhibits the cell cycle, slows or stops cell growth, and can
      cause cell death in cancer cells.

      The combination of Cetuximab (Erbitux®) with palbociclib is not approved by the FDA for
      treating colon cancer and is considered investigational in this research study.

      You are being asked to be in the study because your colon cancer has been found to contain
      the proteins KRAS, NRAS and BRAF that are normal (wild-type). These proteins play an
      important role in the growth and survival of colon cancer. This requirement is important
      because colon cancer with these characteristics has been shown to be more responsive to EGFR
      inhibitors such as cetuximab (Erbitux®), one of the drugs used in this study that is also a
      standard treatment option for your type of cancer. Also, Epidermal Growth Factor Receptor
      (EGFR) has been shown to stimulate cancer cell division, growth and survival by working
      together with KRAS, NRAS and BRAF to activate CDK4/6 and to support an accelerated cell
      cycle. This accelerated cell cycle allows the cancer cells to divide and grow faster than
      your normal cells but also can make them sensitive to the effects of CDK4/6 inhibitor
      palbociclib, a cell-cycle inhibitor.

      To participate in this study you also must meet one of the following requirements:

      A. You have not been treated with EGFR inhibitors such as cetuximab (Erbitux®) or panitumumab

      B. You were treated with anti-EGFR drugs such as cetuximab (Erbitux®) or panitumumab
      (Vectibix®) and experienced at least 4 months of response to treatment, and it has been at
      least 8-weeks since you were last treated with an anti-EGFR drug.

      This will allow investigators to compare the anti-cancer effects of cetuximab (Erbitux®)
      combined with palbociclib in 2 different groups of cancer patients:

        1. Patients that have never received EGFR inhibitors like cetuximab (Erbitux®) or
           panitumumab (Vectibix®). This group will test whether resistance to the combination of
           cetuximab (Erbitux®) plus palbociclib develops in this type of cancer.

        2. Patients that have previously shown an anti-cancer response to EGFR inhibitors, such as
           cetuximab (Erbitux®) or panitumumab (Vectibix®), of four or more months, but then
           developed resistance. This group will test whether the combination of cetuximab
           (Erbitux®) plus palbociclib is more effective against this resistant type of cancer.

      Furthermore, laboratory studies have shown that the combination of EGFR and CDK inhibitors
      provide a stronger anti-cancer effect when used in combination than seen when each inhibitor
      is used alone. Thus, the reason researchers are using cetuximab (Erbitux®) and palbociclib in
      combination is to simultaneously target and inhibit multiple processes inside of the cancer
      cell that are critical to growth and survival of the tumor. With this combination strategy,
      researchers hope to improve upon existing anti-cancer therapies.

Trial Arms

Open-label, single arm, Phase IIExperimentalCetuximab and palbociclib
  • Cetuximab
  • Palbociclib

Eligibility Criteria

        Inclusion Criteria:

        4.1.1 Written informed consent obtained to participate in the study and HIPAA authorization
        for release of personal health information.

        4.1.2 Age ≥ 18 years at the time of consent.

        4.1.3 ECOG Performance Status of 0-2

        4.1.4 Histologically-confirmed metastatic CRC

        4.1.5 Measurable disease according to RECIST v1.1 for solid tumors.

        4.1.6 Documented wild-type in KRAS and NRAS (codons 12, 13, 59, 61, 117, and 146) and in
        BRAF codon 600, based on tumor tissue taken from primary or metastatic site and tested for

        4.1.7 Previously treated with at least two prior regimens of systemic chemotherapy for
        metastatic or locally advanced, unresectable disease, including fluoropyrimidines
        (5-fluorouracil and/or capecitabine), oxaliplatin, and irinotecan.

        A maintenance regimen of 5-fluorouracil or capecitabine, with or without bevacizumab,
        should not be counted as a separate line of treatment For patients who experienced disease
        recurrence during or within 6 months of completion of adjuvant chemotherapy with
        fluoropyrimidine and oxaliplatin, only one regimen of systemic chemotherapy for metastatic
        disease is required

        4.1.8 Demonstrate adequate organ function as defined in the table below; all screening labs
        to be obtained prior to initiating study medications.

        System Laboratory Value Hematological* Hemoglobin (Hgb) ≥ 9 g/dL Absolute Neutrophil Count
        (ANC) ≥ 1500/mm3 Platelets ≥ 100,000/mm3

        Renal* Creatinine OR Calculated creatinine clearance ≤1.5 x ULN

          -  60 mL/min by Cockcroft-Gault formula Hepatic* Bilirubin ≤ 1.0 × upper limit of normal
             (ULN) Aspartate aminotransferase (AST) ≤ 3 × ULN OR

               -  5 × ULN (if liver metastases present) Alanine aminotransferase (ALT) ≤ 3 × ULN OR

               -  5 × ULN (if liver metastases present)

                    -  Note: Hematology and other lab parameters that are ≤ grade 2 BUT still meet
                       criteria for study entry are allowed. Furthermore, changes in laboratory
                       parameters during the study should not be considered adverse events unless
                       they meet criteria for dose modification(s) of study medication outlined by
                       the protocol and/or worsen from baseline during therapy.

        4.1.9 Females of childbearing potential must have a negative serum pregnancy test within 72
        hours prior to initiating study medications. NOTE: Females are considered of childbearing
        potential unless they are surgically sterile (have undergone a hysterectomy, bilateral
        tubal ligation, or bilateral oophorectomy) or they are naturally postmenopausal for at
        least 12 consecutive months. Documentation of postmenopausal status must be provided.

        4.1.10 Females of childbearing potential must be willing to abstain from heterosexual
        activity or to use 2 forms of effective methods of contraception from the time of informed
        consent until 6 months after treatment discontinuation. The two contraception methods can
        be comprised of two barrier methods, or a barrier method plus a hormonal method or an
        intrauterine device that meets <1% failure rate for protection from pregnancy in the
        product label.

        4.1.11 Male patients with female partners must have had a prior vasectomy or agree to use
        an adequate method of contraception (i.e., double barrier method: condom plus spermicidal
        agent) starting with the first dose of study therapy through 6 months after the last dose
        of study therapy.

        4.1.12 Subjects is willing and able to comply with study procedures based on the judgement
        of the investigator or protocol designee.

        4.1.13 Able to swallow capsules, with no surgical or anatomic condition that will preclude
        the patient from swallowing and absorbing oral medications.

        4.1.14 Has not undergone any major surgical procedures for at least 4 weeks, with full
        healing of all surgical wounds

        4.1.15 At sites in the Southeastern U.S., subject must have negative serum test for
        galactose-alpha-1,3-galactose IgE See Appendix 12.5 for map (Note: positive test result is
        predictive of immediate-onset anaphylaxis reaction during first exposure to cetuximab,
        which is prevalent predominantly in limited geographic region of the Southeastern U.S.
        (Clin Mol Allergy 2012;10:1-11).

        4.1.16 For Study Cohort A, has not had prior treatment with cetuximab, panitumumab, or
        other anti-EGFR therapy.

        4.1.17 For Study Cohort B, must have had previous treatment with cetuximab or panitumumab
        with disease control (defined as complete response, partial response, or stable disease)
        lasting for ≥ 4 months in duration and completed their last anti-EGFR therapy 8 weeks prior
        to initiating treatment.


        Exclusion Criteria:

        4.2.1 Active infection requiring systemic therapy.

        4.2.2 Pregnant or breastfeeding (NOTE: breast milk cannot be stored for future use while
        the mother is being treated on study).

        4.2.3 Presence of known, active central nervous system (CNS) metastases.

        4.2.4 Treatment with any investigational drug within 28 days prior to initiating study

        4.2.5 Prior treatment with drug targeting cyclin-dependent kinase (CDK) family.

        4.2.6 Subject is receiving prohibited medications or treatments as listed in section 5.5 of
        the protocol that cannot be discontinued/replaced by an alternative therapy.

        4.2.7 Known hypersensitivity to the components of study drugs or analogs of study drugs.

        4.2.8 Has a known additional malignancy that is active and/or progressive requiring
        treatment; exceptions include basal cell or squamous cell skin cancer, in situ cervical or
        bladder cancer, or other cancer for which the subject has been disease-free for at least
        five years.

        4.2.9 Uncontrolled, severe concomitant comorbidity (e.g. uncontrolled hypertension,
        uncontrolled diabetes mellitus, clinically significant pulmonary disease, clinically
        significant neurological disorder, active or uncontrolled infection).

        4.2.10 History of interstitial lung disease or pneumonitis.

        4.2.11 Any other clinically significant heart disease, including angina pectoris, resting
        bradycardia, left bundle branch block, ventricular tachyarrhythmia, unstable atrial
        fibrillation, acute myocardial infarction, or heart disease requiring cardiac pacemaker or
        implantable cardioverter/defibrillator

        4.2.12 Known psychiatric or substance abuse disorder that would interfere with the ability
        of the patient to comply with trial requirements.

        4.2.13 History of long-QT syndrome.

        4.2.14 Baseline QTcF ≥ 470 msec.

        4.2.15 Concomitant use of drugs known to cause QT prolongation as defined in Appendix 12.4
        and in section 5.5 (Note: Ondansetron at doses ≤ 16 mg or less is allowed)

        4.2.16 History of any of the following cardiovascular conditions within the past 6 months:

          -  Class III or IV congestive heart failure as defined by the New York Heart Association

          -  Cardiac angioplasty or stenting

          -  Myocardial infarction

          -  Unstable angina

          -  Symptomatic peripheral vascular disease or other clinically significant cardiac
Maximum Eligible Age:99 Years
Minimum Eligible Age:18 Years
Eligible Gender:All
Healthy Volunteers:No

Primary Outcome Measures

Measure:Disease Control Rate
Time Frame:4 months
Safety Issue:
Description:To estimate the disease control rate at four months (DCR: CR, PR or SD) after a treatment regimen of cetuximab and palbociclib in patients with refractory KRAS/NRAS/BRAF wild-type metastatic CRC in both a cohort of anti-EGFR naïve therapy patients, and a cohort of patients who might benefit from a re-challenge of anti-EGFR therapy.

Secondary Outcome Measures

Measure:Overall Response rate
Time Frame:4 months
Safety Issue:
Description:Overall Response Rate (ORR) = CR + PR Per Response Evaluation Criteria In Solid Tumors Criteria (RECIST v1.1) for target lesions and assessed by CT scan: Complete Response (CR), Disappearance of all target lesions; Partial Response (PR), >=30% decrease in the sum of the longest diameter of target lesions
Measure:Length of Overall Survival
Time Frame:Up to 3 years
Safety Issue:
Description:Time from first day of treatment until death from any cause
Measure:Length of progression free survival
Time Frame:Up to 3 years
Safety Issue:
Description:Time from first day of treatment until disease progression as defined by RECIST or death from any cause
Measure:Toxicity of Treatment
Time Frame:From day 1 of treatment until grade 3 or 4 events are resolved or deemed irreversible or 3 years
Safety Issue:
Description:The number of treatment-emergent grade 3 and 4 toxicities as defined by National Cancer Institute - Common Terminology Criteria for Adverse Events (NCI CTCAE v4.03)


Phase:Phase 2
Primary Purpose:Interventional
Overall Status:Recruiting
Lead Sponsor:UNC Lineberger Comprehensive Cancer Center

Trial Keywords

  • colon cancer
  • metastatic colon cancer
  • palbociclib
  • cetuximab

Last Updated

August 24, 2020