Cabozantinib (XL184) in Men With Castrate-Resistant Prostate Cancer

This study has been completed.
Information provided by (Responsible Party):
Matthew R. Smith, MD, PhD, Massachusetts General Hospital Identifier:
First received: April 11, 2011
Last updated: October 16, 2015
Last verified: October 2015
Cabozantinib (XL184) is a new drug that is being developed to treat cancer. Cabozantinib works by blocking the "angiogenesis," or the growth of new blood vessels, to the tumor. This is similar to how several other cancer drugs work but in addition Cabozantinib also blocks other pathways that may be responsible for allowing cancer cells to become resistant to these other "anti-angiogenic" treatments. So far cabozantinib has been investigated in treating brain cancer and a rare form of thyroid cancer. This study will explore lower doses of cabozantinib with the goal to find the most effective, safe, and tolerable dose without undesirable side effects.

Condition Intervention Phase
Prostate Adenocarcinoma
Drug: cabozantinib
Phase 1

Study Type: Interventional
Study Design: Allocation: Non-Randomized
Endpoint Classification: Safety/Efficacy Study
Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Treatment
Official Title: Dose-Finding Pilot Study of XL184 in Men With Castrate-Resistant Prostate Cancer and Bone Metastases

Resource links provided by NLM:

Further study details as provided by Massachusetts General Hospital:

Primary Outcome Measures:
  • Partial Response in Bone Scan From Baseline to Week 6 [ Time Frame: Baseline and Week 6 ] [ Designated as safety issue: No ]
    Bone scans will be centrally reviewed and categorized based on comparison of week 6 and baseline imaging. Partial response is defined as 30% or greater decrease in bone scan lesion area from baseline to week 6. An adaptive response design to determine the lowest effective cabozantinib dose among three dose levels (dose level +1, dose level 0 and dose level +1) will be employed.

Enrollment: 34
Study Start Date: April 2011
Study Completion Date: May 2013
Primary Completion Date: May 2013 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: Cohort 1
Dose level 1: cabozantinib 40 mg daily
Drug: cabozantinib
Cabozantinib PO QD
Other Name: XL84
Experimental: Cohort 2
Dose level -1: cabozantinib 20 mg daily
Drug: cabozantinib
Cabozantinib PO QD
Other Name: XL84
Experimental: Expansion cohort
Dose level 0: cabozantinib 40 mg daily
Drug: cabozantinib
Cabozantinib PO QD
Other Name: XL84

Detailed Description:

Cabozantinib will be taken by mouth daily. The first five treatment cycles will be 21 days. All cycles after that will be 42 days long. Patients will keep a diary to record study drug dosing.

During the screening phase patients will receive a physical exam, blood and urine tests, a bone scan, a CT of the abdomen and pelvis, and an MRI scan of total body. On Day 1 of each cycle patients will receive a physical exam and blood and urine tests. Bone scan, CT and MRI scans will be performed at the start of cycles 3 and 5, and then repeated once every 12 weeks.

Patients will continue to receive study treatment as long as they are receiving benefit from the treatment, do not experience any severe or unmanageable side effects, and disease does not get any worse.


Ages Eligible for Study:   18 Years and older
Genders Eligible for Study:   Male
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Histologically confirmed prostate adenocarcinoma
  • Bone metastases confirmed by bone scan
  • Current androgen deprivation therapy
  • Castration-resistant disease based on progression in bone and/or PSA progression
  • Recovered from toxicities related to prior treatment, except alopecia, lymphopenia, other non-clinically significant adverse events
  • Life expectancy of greater than 3 months
  • Normal organ and marrow function
  • Capable of understanding and complying with the protocol requirements
  • Agree to use medically accepted methods of contraception
  • Able to swallow capsules

Exclusion Criteria:

  • More than two prior chemotherapy regimens for metastatic prostate cancer
  • Known untreated, symptomatic or uncontrolled brain metastases
  • Serious or unhealed wound
  • Treatment with anticoagulants
  • Previously identified allergy or hypersensitivity to components of the study treatment formulation
  • History of a different malignancy unless disease-free for at least 5 years, or basal or squamous cell carcinoma of the skin
  • Current antiretroviral therapy
  • Uncontrolled hypertension
  • Uncontrolled intercurrent illness
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT01347788

United States, Massachusetts
Massachusetts General Hospital
Boston, Massachusetts, United States, 02114
Sponsors and Collaborators
Massachusetts General Hospital
Principal Investigator: Matthew R Smith, M.D., Ph.D. Massachusetts General Hospital
  More Information

Responsible Party: Matthew R. Smith, MD, PhD, Professor of Medicine, Massachusetts General Hospital Identifier: NCT01347788     History of Changes
Other Study ID Numbers: 11-005
Study First Received: April 11, 2011
Results First Received: September 15, 2014
Last Updated: October 16, 2015
Health Authority: United States: Food and Drug Administration

Keywords provided by Massachusetts General Hospital:
Prostate cancer
Castration Resistant
Bone Metastases

Additional relevant MeSH terms:
Prostatic Neoplasms
Genital Diseases, Male
Genital Neoplasms, Male
Neoplasms by Histologic Type
Neoplasms by Site
Neoplasms, Glandular and Epithelial
Prostatic Diseases
Urogenital Neoplasms processed this record on November 25, 2015