Magnetic Resonance Imaging in Measuring the Effect of Cabozantinib in Patients With Castrate Resistant Prostate Cancer

Phase 2

Completed

Conditions: Bone Metastases
Recurrent Prostate Cancer
Stage IV Prostate Cancer
Castrate-resistant Prostate Cancer

Interventions: Drug: cabozantinib
Other: laboratory biomarker analysis
Procedure: magnetic resonance imaging

Registration Number: NCT01599793

Lead Sponsor: University of Chicago

Brief Summary: This study is being done to help researchers understand more about prostate cancer that has spread to the bones by using the newest magnetic resonance imaging (MRI) techniques and to better understand the effect of an experimental drug called XL184 (or cabozantinib) on bone disease. The other purposes of the study are to better understand the effect of XL184 on prostate cancer progression, bone pain, and on any cancer cells that patients may have circulating within the blood (called circulating tumor cells)

Detailed Description: PRIMARY OBJECTIVES:

I. To determine effect of XL184 on the functional MRI metrics Ktrans and apparent diffusion coefficient (ADC) within castrate resistant prostate cancer bone metastases.

SECONDARY OBJECTIVES:

I. To quantify progression free survival in men with castrate resistant prostate cancer (CRPC) treated with XL184 according to Prostate Cancer Working Group criteria.

II. To correlate and changes in MRI based functional metrics with bone scan, prostate specific antigen (PSA), Response Evaluation Criteria in Solid Tumors (RECIST) response criteria, circulating tumor cells (CTC) number and with changes in pain.

III. To explore c-MET, phospho-c-MET staining on circulating tumor cells as a predictive biomarker for response and duration of response to XL-184.

OUTLINE:

Patients receive cabozantinib orally (PO) once daily (QD). Treatment continues in the absence of disease progression or unacceptable toxicity.

After completion of study treatment, patients are followed up periodically.

Recruitment & Eligibility

Status: COMPLETED

Sex: Male

Target Recruitment: 19

Inclusion Criteria

Histologically or cytologically confirmed prostate cancer with progressive disease
Evidence of castration resistance defined as disease progression despite a testosterone level < 50ng/dL (or surgical castration)
Evidence of metastatic disease to the bones within the lumbar spine, sacrum, or pelvic bones that is identifiable on screening pelvic MRI
If patient has had prior pelvis radiation therapy (RT), then bone metastases must be out of radiated port (e.g. lumbar or sacral spine)
Any prior therapy for castrate disease acceptable other than prior XL184 with a minimum washout of 28 days for any other anticancer therapy
Patients with castrate resistant disease post antiandrogen therapy/withdrawal must meet at least one of the following criteria:
- Have not received docetaxel chemotherapy
- Have received docetaxel chemotherapy but received less then 225mg/m2 cumulative dose
- Have documented liver metastases
- Have no pain or pain that does not require a long acting (SR) narcotic
- Have received mitoxantrone chemotherapy in the past for CRPC

Exclusion Criteria

Patients who have had chemotherapy or radiotherapy within 4 weeks prior to entering the study
Patients who are receiving any other investigational agents
Prior treatment with other vascular endothelial growth factor (VEGF) or c-MET targeted therapies
History of hematemesis or hemoptysis
The subject has uncontrolled or significant intercurrent illness
The patient requires concomitant treatment, in therapeutic doses, with anticoagulants

Study & Design

Study Type: INTERVENTIONAL

Study Design: SINGLE_GROUP

Arm && Interventions

Group	Intervention	Description
Treatment (enzyme inhibitor therapy)	laboratory biomarker analysis	Patients receive cabozantinib PO QD. Treatment continues in the absence of disease progression or unacceptable toxicity.
Treatment (enzyme inhibitor therapy)	magnetic resonance imaging	Patients receive cabozantinib PO QD. Treatment continues in the absence of disease progression or unacceptable toxicity.
Treatment (enzyme inhibitor therapy)	cabozantinib	Patients receive cabozantinib PO QD. Treatment continues in the absence of disease progression or unacceptable toxicity.

Primary Outcome Measures

Name	Time	Method
Change in the Functional MRI Metrics Ktrans Between 2 Weeks and Baseline	baseline, 2 weeks	Ktrans is a measurement calculating the volume transfer constant of the contrast reagent and essentially is a measurement of vascular perfusion. To determine the effect of XL184 on the functional MRI metrics Ktrans, Ktrans parameters were measured at baseline, two week time-point, 12 weeks, and 24 weeks for disease monitoring. Change between baseline and 2 weeks reported.

Secondary Outcome Measures

Name	Time	Method
Association of Progression Free Survival (PFS) With Ktrans and ADC	From start of treatment to time of progression or death, whichever occurs first, assessed up to 1 year	Time to progression or progression-free survival (PFS) is defined as the duration of time from start of treatment to time of progression or death, whichever occurs first. The approximate survival after standard therapies in this setting is bleak and in the order of months. Too few events for a meaningful statistical analysis; no significant results were obtained in Cox regression analyses. Therefore, we calculated the median PFS time and its 95% confidence interval.
Changes in Bone Scan Response	baseline, 2 weeks	Bone Scan Response at weeks 2, 12, and 24 were collected. Change between baseline and 2 weeks are reported Bone Scan Response were measured as increase, decrease, or stable of bone lesions and scored as 1, -1, or 0, respectively, where higher values represent a worse outcome.
Correlation of Percent Change in the Functional MRI Metrics to RECIST Tumor Measurements	baseline, 12 weeks, and 24 weeks	The protocol proposed to collect RECIST tumor measurements at weeks 0, 12, and 24. However, the data were not collected
Correlation of Percent Change in the Functional MRI Metrics With CTC	baseline, 12 weeks, and 24 weeks	The protocol proposed to collect CTC measurements at weeks 0, 12, and 24. However, the data were not collected
Change of PSA Between 12 Weeks and Baseline	baseline, 12 weeks	PSA at weeks 0, 12, and 24 were collected. Change between baseline and 12 weeks are reported
Change in Pain Scale Between 12 Weeks and Baseline	baseline,12 weeks	Pain scores are measured at baseline and weeks 12, and 24. Change between baseline and 12 weeks are reported . In the pain score ranged from 0 to 10. 10 denotes most pain.