Episode 088: Prostate Cancer Series, Pt. 5 - Systemic Treatment for Localized Prostate Cancer
Jan 10, 2024
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Explore systemic treatment options for localized prostate cancer, including risk stratification, FDA-approved PET tracers, biochemical recurrence, castrate-sensitive vs. castrate-resistant disease, and the pivotal STAMPEDE trial. Also, delve into PSMA PET imaging, the impact of Anderson receptor antagonists, and Thanksgiving dishes as a case study backdrop.
Risk stratification and staging are essential for understanding localized prostate cancer, considering PSA levels, disease extent, and Gleason pattern.
PSMA PET CT is a valuable imaging modality for prostate cancer, with higher sensitivity and specificity compared to other tracers, and PSMA (prostate-specific membrane antigen) is an ideal target for its higher density in prostate cancer cells.
Deep dives
Prostate Cancer Series: Systemic Therapy for Non-Metastatic Prostate Cancer
This podcast episode focuses on the medical oncology portion of the prostate cancer series, specifically discussing systemic therapy for non-metastatic prostate cancer. It highlights the importance of understanding risk stratification and staging, considering PSA levels, disease extent, and Gleason pattern. The use of PSMA PET CT for imaging is discussed, which has higher sensitivity and specificity for detecting bone and soft tissue lesions. The significance of PSA doubling time is emphasized, indicating high-risk features and the need for staging imaging. Treatment options for biochemical recurrence after surgery or radiation therapy are explored, including salvage radiation therapy and the role of androgen deprivation therapy (ADT). For castration-sensitive disease, ADT monotherapy is recommended, while for castration-resistant disease with a PSA doubling time of less than 10 months, Anderson receptor antagonists (Abiraterone and Enzalutamide) are suggested. The podcast also delves into adjuvant therapy for very high-risk prostate cancer, highlighting the Stampede trials that showed improved metastasis-free survival with the addition of Abiraterone and Prednisone to ADT. Important limitations of the trials and the need for appropriate post-protocol care are noted. Overall, the episode provides valuable insights for understanding and managing non-metastatic prostate cancer.
PSMA PET CT Imaging and its Role in Prostate Cancer
PSMA PET CT is discussed as a valuable imaging modality for prostate cancer, with higher sensitivity and specificity compared to other tracers. The podcast highlights PSMA (prostate-specific membrane antigen) as an ideal target due to its higher density in prostate cancer cells. The ability of PSMA PET CT to detect bone and soft tissue lesions is mentioned, along with its use in initial staging imaging and highlighting involved pelvic nodes before treatment. The limitations and spatial resolution of PET imaging are acknowledged. The episode also touches upon alternative PET tracers such as Gallium 68 PSMA and F18 Fluciclovine, but underscores PSMA PET as the current gold standard. The importance of considering false positives and the need for imaging validation is emphasized.
Adjuvant Therapy for Very High-Risk Prostate Cancer
The podcast covers adjuvant therapy for patients with very high-risk prostate cancer, focusing on the role of Abiraterone and Prednisone in addition to androgen deprivation therapy (ADT). The Stampede trials are discussed, which showed improved metastasis-free survival with the addition of Abiraterone and Prednisone. The criteria for adjuvant therapy eligibility, including PSA level greater than 40, extra-prostatic extension, and combined Gleason score of eight or higher, are highlighted. The limitations of the trials, particularly in assessing overall survival and appropriate post-protocol care, are acknowledged. The significant improvement in metastasis-free survival and the potential for long-term prostate cancer control are emphasized.
Treatment Options for Biochemical Recurrence in Prostate Cancer
The podcast explores treatment options for patients with biochemical recurrence in prostate cancer, discussing salvage radiation therapy and the significance of PSA doubling time. For patients with a rising PSA after surgery, referral to radiation oncology for salvage radiation therapy is recommended. Patients' post-radiation PSA levels and the importance of PSMA PET imaging for ruling out metastatic disease are highlighted. The distinction between castration-sensitive and castration-resistant disease is explained, with different treatment approaches based on testosterone levels and PSA doubling time. ADT monotherapy is recommended for castration-sensitive disease, while Anderson receptor antagonists (Abiraterone and Enzalutamide) are suggested for castration-resistant disease with a PSA doubling time of less than 10 months. The importance of individualizing treatment and considering quality of life is emphasized.
As we continue our exploration of prostate cancer, we turn our focus to one of the earliest areas where medical oncologists are commonly involved: systemic therapy for non-metastatic prostate cancer. In this episode, we will review how to risk stratify localized prostate cancer, differences in FDA-approved prostate-specific PET tracers, how to evaluate for biochemical recurrence following surgical and radiation based treatments for localized prostate cancer, and when to consider utilizing systemic therapy in non-metastatic disease.
Content:
- A refresher on how we think about systemic treatment options for localized prostate cancer
- What role does imaging play?
- Definition of biochemical recurrence after upfront surgery vs. radiation
- What is castrate-sensitive vs. castrate-resistant disease?
- What to do if someone is already on ADT at the time of recurrence?
- The fundamental design behind the pivotal STAMPEDE trial and the role it plays in helping us care for our patients with localized prostate cancer
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