Evaluation of Neuroendocrine Differentiation as a Potential Mechanism of Tumor Recurrence Following Radiotherapy in Prostate Carcinoma


About this study

This is a pilot study to test a hypothesis that a greater increase in serum chromogranin A (CgA) after a definitive radiotherapy (RT) with or without androgen deprivation therapy (ADT) is associated with a higher risk of prostate cancer recurrence after RT. Serum CgA level is measured before the start of RT and/or the start of neoadjuvant ADT for patients undergoing a definitive RT with or without ADT. CgA is also measured at various pre-defined post-RT time points. The study will analyze the followings: 1. Change in CgA level at various pre-defined post-RT time points from the baseline, 2. Correlation between the extent of post-therapy CgA change and Gleason score of malignancy, 3. Correlation between the extent of post-therapy CgA change and treatment outcome.

Participation eligibility

Participant eligibility includes age, gender, type and stage of disease, and previous treatments or health concerns. Guidelines differ from study to study, and identify who can or cannot participate. There is no guarantee that every individual who qualifies and wants to participate in a trial will be enrolled. Contact the study team to discuss study eligibility and potential participation.

Inclusion Criteria:

  • Clinically localized prostate carcinoma, T1-T4 N0M0, any Gleason Score (Gleason Score 7 including those with T3 disease as well as ≤ T2c disease), any prostate-specific antigen (PSA), or Biochemical relapse with clinically suspicious (based on MRI or clinical examination) or biopsy-proven local recurrence in the prostatic fossa after a radical prostatectomy
  • ≥18 years old
  • Histologic diagnosis of prostate adenocarcinoma
  • Signed informed consent

Exclusion Criteria:

  • Biochemical relapse alone without clinically suspicious (i.e. no suspicious lesion on MRI of the prostatic bed) or biopsy-proven local recurrence in the prostatic fossa
  • Regional pelvic node metastasis (N1)
  • Distant metastasis (M1)
  • Concurrent or previous cytotoxic medications
  • Medical or psychological conditions that in the opinion of the investigator would not allow follow-up

Participating Mayo Clinic locations

Study statuses change often. Please contact the study team for the most up-to-date information regarding possible participation.

Mayo Clinic Location Status Contact

Jacksonville, Fla.

Mayo Clinic principal investigator

Steven Buskirk, M.D.

Open for enrollment

Contact information:

Anna Harrell B.S., M.P.H., CCRP



Rochester, Minn.

Mayo Clinic principal investigator

Chunhee Choo, M.D.

Open for enrollment

Contact information:

Adam Amundson



Scottsdale/Phoenix, Ariz.

Mayo Clinic principal investigator

William Wong, M.D.

Open for enrollment

Contact information:

Courtney James



More information


Publications are currently not available

Study Results Summary

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Supplemental Study Information

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