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Predicting pelvic lymph node involvement in current-era prostate cancer.

Sophia Rahman1, Harry Cosmatos, Giatri Dave

  • 1Department of Radiation Oncology, Kaiser Permanente Medical Center, Los Angeles, CA, USA. sophs1578@yahoo.com

International Journal of Radiation Oncology, Biology, Physics
|February 9, 2011
PubMed
Summary

The Roach formula overestimates the risk of lymph node metastasis in prostate cancer patients screened with PSA. Current patients have lower nodal involvement rates than predicted by this older formula.

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Area of Science:

  • Urology
  • Oncology
  • Medical Diagnostics

Background:

  • The Roach formula, developed in 1993, predicts pelvic lymph node involvement in prostate cancer.
  • It uses prostate-specific antigen (PSA) levels and Gleason scores.
  • Widespread PSA screening has led to earlier prostate cancer detection, potentially affecting the formula's accuracy.

Purpose of the Study:

  • To retrospectively evaluate the validity of the Roach formula in contemporary prostate cancer patients.
  • To assess if the Roach score overestimates the risk of nodal metastasis in the current screening era.

Main Methods:

  • Retrospective review of 1,022 patients with clinical T1c-T3 prostate cancer undergoing radical prostatectomy and pelvic node dissection (2001-2009).
  • Calculation of predicted nodal involvement risk using the Roach formula for each patient.

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  • Comparison of predicted risk with actual nodal metastasis rates observed post-surgery.

    • Main Results:

    • The study included 1,022 patients, with 4.1% having nodal metastasis.
    • The Roach formula consistently overestimated the risk of nodal involvement across all score ranges.
    • Overestimation factors ranged from 2.5-fold to 4.5-fold depending on the Roach score.

    Conclusions:

    • The Roach formula overpredicts pelvic nodal involvement risk in current prostate cancer patients.
    • Contemporary patients, often diagnosed at earlier stages (T1c/T2) via PSA screening, have lower nodal involvement rates than predicted.
    • The formula's utility may be limited in the current era of prostate cancer management.