for males ages 18 years and up (full criteria)
at San Diego, California and other locations
study started
estimated completion
Principal Investigator
by John K. Parsons



This phase IIa trial investigates the biomarker (plasma levels of PSA) of low-dose apalutamide in patients with prostate cancer confined in the prostate gland before surgery. Testosterone can cause the growth of prostate cancer cells, and Apalutamide blocks the use of testosterone by the tumor cells. Giving low-dose apalutamide before prostate surgery may lead to lowered PSA levels in men with prostate cancer confined to the prostate gland.

Official Title

Clinical Study of Bioactivity of Low Dose Apalutamide in Prostate Cancer Patients Scheduled for Prostatectomy



  1. To determine the effects of low dose apalutamide on circulating levels of prostate specific antigen (PSA).


  1. To determine the effect of low dose apalutamide on:

Ia. Reversibility of testosterone levels 7-14 days post intervention; Ib. Post-intervention plasma trough apalutamide concentration; Ic. Health-related quality of life.


  1. To determine the effects of apalutamide on intra-prostatic immune cell infiltration and Gleason score as exploratory endpoints.


Patients receive apalutamide orally (PO) on study. Patients also undergo collection of blood samples throughout the study.


Localized Prostate Carcinoma, Prostate Adenocarcinoma, Stage I Prostate Cancer AJCC v8, Stage II Prostate Cancer AJCC v8, Stage IIIA Prostate Cancer AJCC v8, Stage IIIB Prostate Cancer AJCC v8, Prostatic Neoplasms, Apalutamide, Biospecimen Collection, Quality-of-Life Assessment


You can join if…

Open to males ages 18 years and up

  • Histologically confirmed organ-confined adenocarcinoma of the prostate (PCa) suitable for prostatectomy
  • Gleason score =< (4+4), however no Gleason pattern 5
  • Current serum PSA =< 20 ng/ml
  • Age > 18 years
  • Karnofsky >= 70%
  • Leukocytes >= 3,000/uL
  • Absolute neutrophil count >= 1,500/uL
  • Platelets >= 100,000/uL
  • Total bilirubin =< 1.5 x institutional upper limit of normal (ULN) (note: in subjects with Gilbert's syndrome, if total bilirubin is > 1.5 x ULN, measure direct and indirect bilirubin and if direct bilirubin is =< 1.5 x ULN, subject may be eligible)
  • Aspartate aminotransferase (AST) (serum glutamic oxaloacetic transaminase [SGOT])/alanine aminotransferase (ALT) (serum glutamic pyruvic transaminase [SGPT]) < 2.5 x institutional ULN
  • Creatinine < 2 x institutional ULN
  • Thyroid stimulating hormone (TSH) within the institutional normal range
  • Willing to use adequate contraception (barrier method; abstinence; subject has had a vasectomy; or partner is using effective birth control or is postmenopausal) for the duration of study participation
  • Ability to understand and the willingness to sign a written informed consent document

You CAN'T join if...

  • Prior or ongoing hormonal treatment for prostate cancer including, but not limited to orchiectomy, antiandrogens, abiraterone, ketoconazole, or estrogens, or luteinizing hormone-releasing hormone (LHRH) agonists/antagonists. Men on stable doses of 5-alpha reductase inhibitors (e.g., finasteride, dutasteride) are eligible as long as there is no planned dose change while on study
  • Patients who have prostate cancer with distant metastases
  • Presence of neuroendocrine differentiation in the prostate biopsies
  • Serum testosterone (blood collected between 7-10 AM for men < 45 years of age and prior to 2 PM for men >= 45 years of age) < 200 ng/dL
  • Have a history of prior malignancies other than prostate cancer within the past 2 years, excluding non-melanoma skin cancer
  • Severe or unstable angina, myocardial infarction, symptomatic congestive heart failure, arterial or venous thromboembolic events (e.g., pulmonary embolism, cerebrovascular accident including transient ischemic attacks), or clinically significant ventricular arrhythmias within 6 months prior to registration
  • History of seizure or known condition that may pre-dispose to seizure (including but not limited to prior stroke, transient ischemic attack, loss of consciousness within 1 year prior to registration, brain arteriovenous malformation; or intracranial masses such as schwannomas and meningiomas that are causing edema or mass effect)
  • Use of drugs known to lower the seizure threshold, including: atypical antipsychotics (e.g. clozapine, olanzapine, risperidone, ziprasidone), bupropion, lithium, meperidine, pethidine, phenothiazine antipsychotics (e.g. chlorpromazine, mesoridazine, thioridazine), and tricyclic antidepressants (e.g. amitriptyline, desipramine, doxepin, imipramine, maprotiline, mirtazapine)
  • Concurrent use of drugs in category X drug interactions with apalutamide
  • Participants may not be receiving any other investigational agents
  • History of allergic reactions attributed to compounds of similar chemical composition of apalutamide
  • Uncontrolled intermittent illnesses or medical conditions which, in the opinion of the treating physician, would make this protocol unreasonably hazardous for the patient. Such illnesses/conditions may include, but are not limited to, hypertension, ongoing or active infection, or psychiatric illness/social situations


  • UC San Diego Medical Center - Hillcrest not yet accepting patients
    San Diego California 92103 United States
  • USC / Norris Comprehensive Cancer Center accepting new patients
    Los Angeles California 90033 United States

Lead Scientist at UCSD


accepting new patients at some sites,
but this study is not currently recruiting here
Start Date
Completion Date
National Cancer Institute (NCI)
Phase 2 Prostate Cancer Research Study
Study Type
Expecting 40 study participants
Last Updated