Indian Journal of Nuclear Medicine

ORIGINAL ARTICLE
Year
: 2020  |  Volume : 35  |  Issue : 2  |  Page : 93--99

Incremental value of Ga-68 prostate-specific membrane antigen-11 positron-emission tomography/computed tomography scan for preoperative risk stratification of prostate cancer


UN Pallavi1, Sanjay Gogoi2, Parul Thakral1, Vindhya Malasani1, Kanchan Sharma1, Divya Manda1, Subha Shankar Das1, Vineet Pant1, Ishita Sen1 
1 Department of Nuclear Medicine, Fortis Memorial Research Institute, Gurgaon, Haryana, India
2 Department of Urology, Manipal Hospitals, New Delhi, India

Correspondence Address:
Dr. Ishita Sen
Department of Nuclear Medicine, Fortis Memorial Research Institute, Gurgaon - 122 002, Haryana
India

Background: Prostate cancer (PC) is the second-most common cause of cancer.68Ga-prostate-specific membrane antigen (PSMA)-11 positron-emission tomography/computed tomography (PET/CT) scan help in accurate staging of PC owing to its high PSMA avidity and specificity. The aim of this prospective observational study was to determine the incremental value of Ga-68 PSMA-11 PET/CT over multiparametric magnetic resonance imaging (mpMRI) in the locoregional staging of intermediate- and high-risk PC using histopathology from radical prostatectomy specimens as a gold standard. Materials and Methods: This was a prospective study, including 35 patients with biopsy-proven prostate carcinoma. All the patients underwent whole-body Ga-68 PSMA-11 PET/CT scans along with mpMRI including a dedicated pelvic imaging protocol within a time window of ± 10 days. The reference standard was based on histopathological results, postprostatectomy. Results: All 35 patients showed Ga-68 PSMA-11-avid disease, of which 29 underwent radical prostatectomy, one underwent radiation therapy, and five did not undergo surgery owing to metastases. A total of 52 PC lesions were detected in 29 patients on histopathology. Of 52 lesions, 29 lesions were identified in prostate parenchyma and 23 were extraprostatic lesions on histopathology. Ga-68 PSMA-11 PET/CT detected a total of 45 lesions, of which 29 lesions were located within the prostate parenchyma and 16 were representative of extraprostatic lesions. mpMRI detected a total of 36 lesions, of which 29 lesions were located within the prostate parenchyma and seven were representative of extraprostatic lesions. The overall sensitivity of68Ga-PSMA PET/CT and mpMRI in the detection of lesions was 86.2% and 68.6%, respectively. However, the overall specificity was 94.7% and 89.1% for68Ga-PSMA and mpMRI, respectively. Conclusion: Ga-68 PSMA-11 PET/CT provided superior locoregional preoperative staging of PC as compared to mpMRI in intermediate- and high-risk PC patients.


How to cite this article:
Pallavi U N, Gogoi S, Thakral P, Malasani V, Sharma K, Manda D, Das SS, Pant V, Sen I. Incremental value of Ga-68 prostate-specific membrane antigen-11 positron-emission tomography/computed tomography scan for preoperative risk stratification of prostate cancer.Indian J Nucl Med 2020;35:93-99


How to cite this URL:
Pallavi U N, Gogoi S, Thakral P, Malasani V, Sharma K, Manda D, Das SS, Pant V, Sen I. Incremental value of Ga-68 prostate-specific membrane antigen-11 positron-emission tomography/computed tomography scan for preoperative risk stratification of prostate cancer. Indian J Nucl Med [serial online] 2020 [cited 2020 May 31 ];35:93-99
Available from: http://www.ijnm.in/article.asp?issn=0972-3919;year=2020;volume=35;issue=2;spage=93;epage=99;aulast=Pallavi;type=0