Early detection of recurrent prostate cancer (PCa) is of paramount importance to deliver prompt and accurate therapy reducing the chance of progression to metastatic disease. However, current imaging modalities such as conventional computed tomography, MRI and PET scanning do not provide sufficient sensitivity, especially at lower prostate-specific antigen values. Moreover, biological characterization of PCa has become increasingly important to provide patient-specific therapy and current imaging poorly characterizes disease aggressiveness. The current uprise of novel PET tracers in recurrent and metastatic PCa shows promising, yet variable sensitivities and specificities in detection, indicating the need for further studies. In this review, we highlight current and new PET tracers that have been developed to improve the detection of recurrent and metastatic PCa.
KEYWORDS• biochemical recurrenceProstate cancer (PCa) is the most common noncutaneous malignancy in American men with 180,890 new cases and 26,120 deaths estimated in 2016 alone [1]. Recent advances in detection, monitoring and treatment of the disease include the growing use of multiparametric MRI, transrectal ultrasound/fusion MRI-guided biopsies and new focal therapies. Primary definitive therapy options for PCa remain radiation therapy (RT) and radical prostatectomy (RP), which are used with curative intent, although both methods have improved over time. Despite the high success rates in primary treatment, 15-25% of patients still experience biochemical recurrence (BCR), following primary definitive therapy with RP or RT [2][3][4][5][6][7]. The definition of BCR varies between therapy methods. For instance, following RP a rising PSA above 0.2 ng/ml defines BCR whereas following RT BCR is defined as a PSA change of 2.0 ng/ml above the nadir following RT and is known as the Phoenix criteria [7]. As rising PSA in post primary therapy patients is an indicator of PCa BCR, close monitoring of serum PSA levels following treatment is critical [7,8]. In the case of BCR, early detection and initiation of therapy is a key to better long-term outcomes. Early intervention is associated with a lower rate of metastatic disease. Thus, accurate and early detection of recurrence leading to earlier treatment will aid in hindering the progression of BCR to metastatic disease.Multiple imaging modalities exist for the detection of recurrent PCa including computed tomography (CT), bone scintigraphy, MRI and PET. However, the need for more sensitive and specific imaging modalities to detect early recurrent and metastatic PCa has been prompted by evidence supporting early treatment. In addition to more sensitive and specific imaging, there has been a 'thrust' toward personalized and targeted management to discover disease phenotype and predict clinical outcomes earlier, which PET/CT has answered the call [9]. The future demands more For reprint orders, please contact: reprints@futuremedicine.com