Title

Safety and Targeting of Anti-hk2 Antibody in mCRPC
A Phase 0 Study to Assess the Safety and Biodistribution of a Novel Radiolabeled Antibody Targeting Human Kallikrein-2 (hk2) in Subjects With Metastatic Castration-resistant Prostate Cancer.
  • Phase

    Early Phase 1
  • Study Type

    Interventional
  • Status

    Recruiting
  • Study Participants

    18
This is an imaging trial, to develop h11B6 as a therapeutic radiopharmaceutical for men with mCRPC.

This imaging study will be conducted to confirm the safety and estimate the mass amount of antibody h11B6, and confirm in vivo tumor targeting of the antibody, using Indium-111 (111In) radiolabeled h11B6 in subjects with advanced prostate cancer. This study will also provide the dosimetric information crucial for Phase 1 therapy.
It is the intent to develop h11B6 as a therapeutic radiopharmaceutical for men with mCRPC. This Phase 0 study will be conducted to confirm the safety, estimate the mass amount, and confirm in vivo tumor targeting of the antibody. This study will use Indium-111 (111In) radiolabeled h11B6 in subjects with mCRPC to image known sites of disease and identify a favorable mass amount of antibody for satisfactory tumor targeting with minimal/no accumulation off-target. In cohort 1, In-111 labeled h11B6 will remain fixed at 2 mg, and additional h11B6 will be added in 2 sub-cohorts (8 mg and 18 mg respectively); up to 6 patients may be entered into a sub-cohort. Additional patients (up to 6) will be studied once the most favorable mass and imaging time point have been established, to establish targeting of antibody to known disease.

This study will provide the dosimetric information crucial for Phase 1 therapy.
Study Started
Sep 18
2019
Primary Completion
Dec 30
2021
Anticipated
Study Completion
Dec 31
2021
Anticipated
Last Update
Apr 09
2021

Drug 111In-DOTA-h11B6

4-6 mCi 111In labeled to 2 mg DOTA-h11B6; 0, 8 or 18 mg additional h11B6.

Dosimetry and targeting Experimental

Three sub-cohorts in cohort 1 will receive one slow bolus IV injection of 2 mg 111In-DOTA-h11B6 with 0, 8 and 18 mg unlabeled h11B6 respectively. In cohort 2, up to 6 patients will receive a slow bolus IV injection of 2 mg 111In-DOTA_h11B6 with any unlabeled h11B6 as determined from cohort 1, and will be imaged at one time-point

Criteria

Inclusion Criteria:

Subjects with mCRPC will be eligible if they meet the following criteria:
Eastern Cooperative Oncology Group (ECOG) ≤ 1
Histologically or cytologically confirmed adenocarcinoma of the prostate
Castrate levels of testosterone (<50 ng/dL [1.74 nmol/L])
Metastatic disease documented by imaging
Documented progressive mCRPC with androgen involvement as defined by - Prostate Cancer Working Group 3
Acceptable laboratory parameters
At least 28 days since administration of any therapeutic radioactive isotope
Able to tolerate the conditions required to perform imaging studies (e.g., lying flat for at least 1 hour).

Exclusion Criteria:

Known hypersensitivity to proteins, or other allergic diathesis that, in the opinion of the investigator, makes an immune response to humanized antibody likely
Radiotherapy or immunotherapy within 30 days, or single fraction of palliative radiotherapy within 14 days of administration of study agent
Any condition that, in the opinion of the Investigator, would impair the subject's ability to comply with study procedures and required study visits
Active, symptomatic, or untreated brain metastases.
No Results Posted