Study of Cabozantinib in Combination With Atezolizumab Versus Second NHT in Subjects With mCRPC (CONTACT-02)

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Status and phase

Active, not recruiting
Phase 3


Metastatic Prostate Cancer
Prostate Adenocarcinoma


Drug: Cabozantinib
Drug: Abiraterone Acetate
Drug: Prednisone
Drug: Atezolizumab
Drug: Enzalutamide

Study type


Funder types




Details and patient eligibility


This is a Phase 3, multi-center, randomized, open-label, controlled study designed to evaluate the safety and efficacy of cabozantinib given in combination with atezolizumab versus a second novel hormonal therapy (NHT) in men with metastatic castration-resistant prostate cancer (mCRPC) who have previously been treated with one, and only one, NHT for their prostate cancer disease.

Full description

The primary objective of this study is to evaluate the efficacy of cabozantinib (XL184) in combination with atezolizumab versus a second NHT (abiraterone or enzalutamide) in subjects with mCRPC who have previously been treated with one, and only one, NHT (e.g. abiraterone, apalutamide, darolutamide, or enzalutamide) to treat metastatic castration-sensitive prostate cancer (mCSPC), non-metastatic CRPC (M0 CRPC), or mCRPC, and who have measurable extrapelvic disease. The multiple primary efficacy endpoints comparing the experimental arm and control arm are Duration of Progression Free Survival (PFS) per RECIST 1.1 by Blinded Independent Radiology Committee (BIRC) and Duration of Overall Survival (OS). The secondary efficacy endpoint is Objective Response Rate (ORR) per RECIST 1.1 per BIRC.


575 patients




18+ years old


No Healthy Volunteers

Inclusion criteria

  • Men with histologically or cytologically confirmed adenocarcinoma of the prostate
  • Prior treatment with one, and only one, NHT (eg, abiraterone, apalutamide, darolutamide, or enzalutamide) for castration-sensitive locally advanced (T3 or T4) or mCSPC, M0 CRPC, or mCRPC
  • Surgical or medical castration, with serum testosterone ≤ 50 ng/dL (≤ 1.73 nmol/L) at screening
  • Measurable (extrapelvic soft tissue) metastatic disease per Investigator assessment defined by at least one of the following: measurable visceral disease (eg, adrenal, kidney, liver, lung, pancreas, spleen) per RECIST 1.1; OR measurable extrapelvic adenopathy (ie, adenopathy above the aortic bifurcation)
  • Progressive disease at study entry as defined by specific criteria for prostate specific antigen (PSA) progression OR soft tissue disease progression in the opinion of the Investigator (Note: subjects with bone disease progression alone are not eligible)
  • Age ≥ 18 years old or meeting country definition of adult, whichever is older, on the day of consent
  • ECOG performance status of 0 or 1
  • Recovery to baseline or ≤ Grade 1 per Common Terminology Criteria for Adverse Events (CTCAE) v5 from toxicities related to any prior treatments, unless AE(s) are clinically nonsignificant and/or stable on supportive therapy in the opinion of the Investigator
  • Adequate organ and marrow function based upon specific laboratory assessments obtained within 21 days prior to randomization
  • Understanding and ability to comply with protocol requirements

Exclusion criteria

  • Any prior nonhormonal therapy initiated for the treatment of mCRPC
  • Receipt of abiraterone within 1 week; cyproterone within 10 days; or flutamide, nilutamide, bicalutamide, enzalutamide, or other androgen-receptor inhibitors within 2 weeks before randomization
  • Radiation therapy within 4 weeks (2 weeks for bone metastases) prior to randomization (subjects with clinically relevant ongoing complications from prior radiation therapy are not eligible)
  • Known brain metastases or cranial epidural disease unless adequately treated and clinically stable at least 4 weeks prior to randomization
  • Symptomatic or impending spinal cord compression or cauda equina syndrome
  • Concomitant anticoagulation with oral anticoagulants (some specific exceptions apply)
  • Administration of a live, attenuated vaccine within 30 days prior to randomization
  • Systematic treatment with, or any condition requiring, either corticosteroids (>10 mg daily prednisone equivalent) or other immunosuppressive medications within 14 days prior to randomization
  • Uncontrolled, significant intercurrent or recent illness
  • Major surgery within 4 weeks prior to randomization
  • Corrected QT interval calculated by the Fridericia formula (QTcF) > 480 ms per ECG within 21 days before randomization
  • Inability or unwillingness to swallow pills or receive IV administration
  • Previously identified allergy or hypersensitivity to components of the study treatment formulations or history of severe infusion-related reactions to monoclonal antibodies
  • Any other active malignancy at time of randomization or diagnosis of another malignancy within 2 years prior to randomization that requires active treatment (some exceptions apply such as locally curable cancers that have apparently been cured).

Trial design

Primary purpose




Interventional model

Parallel Assignment


None (Open label)

575 participants in 2 patient groups

Experimental Arm
Experimental group
Subjects with mCRPC will receive cabozantinib 40mg oral, qd + atezolizumab 1200mg infusion, q3w
Drug: Atezolizumab
Drug: Cabozantinib
Control Arm
Active Comparator group
Subjects with mCRPC will receive active comparator of EITHER abiraterone 1000mg oral, qd + prednisone 5 mg oral, bid; OR enzalutamide 160mg oral, qd as designated by the Investigator prior to randomization
Drug: Enzalutamide
Drug: Prednisone
Drug: Abiraterone Acetate

Trial contacts and locations



Central trial contact

Exelixis Clinical Trials; Backup or International

Data sourced from

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