A Study of Vismodegib in Men With Metastatic CRPC With Accessible Metastatic Lesions for Tumor Biopsy

Inclusion Criteria

• Men with metastatic castration-resistant prostate cancer (mCRPC), with accessible metastatic soft-tissue lesions for tumor biopsy
• Greater than 18 years of age
• Evidence of disease progression (PSA progression, or radiographic/clinical progression [PCWG2])
• PSA progression is defined as at least two consecutive rises in serum PSA, obtained at a minimum of 1-week intervals, and each value ≥ 2.0 ng/mL.
• Radiographic progression is defined for soft tissue lesions using RECIST criteria, i.e. an increase greater than 20% in the sum of the longest diameter of all target lesions based on the smallest sum longest diameter since treatment started or the appearance of one of more new lesions with a confirmatory scan 6 or more weeks later. Radiographic progression will be defined for bone lesions as the appearance of two new lesions with a confirmatory scan performed 6 or more weeks later that shows at least 2 or more additional new lesions.
• Presence of ≥1 metastatic site (nodal, visceral) that is amenable to core biopsy
• Castrate serum testosterone ( 40 mL/minute (See section 12.2 for formula)
• Absolute neutrophil count (ANC) must be ≥ 1500/μL
• Platelet count must be ≥ 100,000/μL
• Willing and able to provide written informed consent and HIPAA authorization for the release of personal health information.

NOTE: HIPAA authorization may be either included in the informed consent or obtained separately.

• Karnofsky Performance status/ECOG Performance Status ≥70/2 (Appendix A: Performance Status Criteria)
• Male patients must use condoms at all times, even after a vasectomy, during sexual intercourse with female partners of reproductive potential during treatment with vismodegib and for 2 months after the last dose to avoid exposing a pregnant partner and unborn fetus to vismodegib.

Exclusion Criteria

• Current use of systemic corticosteroids (>5 mg prednisone)
• Known brain metastases, or untreated meningeal/dural disease
• Receiving any other investigational agents or receipt of another investigational agent within 4 weeks of study entry
• Patients taking anticoagulants or with a history of a bleeding diathesis (due to need for visceral biopsy)
• Use of any prohibited concomitant medications (washout period of 1 week)
• Insufficient time from last prior regimen or radiation exposure (washout period of 4 weeks)
• Grade > 2 treatment-related toxicity from prior therapy
• Any other condition which, in the opinion of the Investigator, would preclude participation in this trial