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Lorenzo GD, Zappavigna S, Crocetto F, Giuliano M, Ribera D, Morra R, Scafuri L, Verde A, Bruzzese D, Iaccarino S, Costabile F, Onofrio L, Viggiani M, Palmieri A, De Placido P, Marretta AL, Pietroluongo E, Luce A, Abate M, Navaeiseddighi Z, Caputo VF, Celentano G, Longo N, Ferro M, Morelli F, Facchini G, Caraglia M, De Placido S, Buonerba C. Assessment of Total, PTEN -, and AR-V7 + Circulating Tumor Cell Count by Flow Cytometry in Patients with Metastatic Castration-Resistant Prostate Cancer Receiving Enzalutamide. Clin Genitourin Cancer 2021; 19:e286-e298. [PMID: 33958297 DOI: 10.1016/j.clgc.2021.03.021] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2021] [Revised: 03/22/2021] [Accepted: 03/27/2021] [Indexed: 02/06/2023]
Abstract
INTRODUCTION Metastatic castration-resistant prostate cancer (mCRPC) is a deadly disease. Enzalutamide is an oral second-generation anti-androgen that is active in mCRPC. Circulating tumor cells (CTC) count correlates with overall survival (OS) in mCRPC, whereas detection of the androgen-receptor splice variant 7 (AR-V7) in CTC predicts poor response to oral second-generation anti-androgens. Also, loss of PTEN (phosphatase and tensin homolog) in CTC is a biomarker of poor prognosis in mCRPC. PATIENTS AND METHODS In this translational study, we employed flow cytometry to assess total, PTEN-, and AR-V7+ CTC count per 7.5 mL of whole blood in a prospective cohort of patients with mCRPC receiving enzalutamide. RESULTS CTCs were assessed in a total of 45 men with mCRPC at baseline and at 12 weeks. Overall, CTC, PTEN- CTC, and AR-V7+ CTC detection rate was high, at baseline, with 84.4%, 71.1%, and 51.1% of samples showing at least 1 cell/7.5-mL blood, respectively, and after 3 months, with 93.3%, 64.4%, and 77.7% of samples showing at least 1 cell/7.5-mL blood, respectively. Median radiographic progression-free survival (rPFS) and OS were 6 (95% confidence interval [CI], 5.6-9) and 14.3 (95% CI, 12.8-20.3) months, respectively. Median (interquartile range) total CTC count at baseline was 5 (3; 8), whereas median (interquartile range) PTEN- CTC count was 2 (0; 4) and median (interquartile range) AR-V7+ CTC count was 1 (0; 3). At baseline, ≥ 5 versus < 5 total CTC count was associated with worse rPFS (hazard ratio [HR], 2.35; 95% CI, 1.14-4.84; P= .021) and OS (HR, 3.08; 95% CI, 1.45-6.54; P = .003), whereas ≥ 2 versus < 2 PTEN- CTC count was associated with worse rPFS (HR, 3.96; 95% CI, 1.8-8.72; P= .001) and OS (HR, 2.36; 95% CI, 1.12-5; P= .025). Finally, ≥ 1 versus < 1 AR-V7+ CTC count was also associated with worse rPFS (HR, 5.05; 95% CI, 2.4-10.64; P< .001) and OS (HR, 2.25; 95% CI, 1.1-4.58; P= .026). CONCLUSIONS Despite multiple limitations, including the small sample size, our preliminary study suggests that assessment of CTC via flow cytometry may provide potentially useful prognostic and predictive information in advanced prostate cancer. Further studies are warranted. Micro-Abstract: In this study, men with metastatic castration-resistant prostate cancer, scheduled to start enzalutamide, were assessed for circulating tumor cell count and molecular characterization (total, PTEN-, and AR-V7+ circulating tumor cell count) by the use of flow cytometry. We found that flow cytometry could be used to enumerate circulating tumor cells, but also to assess molecular biomarkers on their surface.
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Affiliation(s)
- Giuseppe Di Lorenzo
- Department of Clinical Medicine and Surgery, University Federico II of Naples, Naples, Italy; Department of Medicine and Health Sciences "Vincenzo Tiberio," University of Molise, Campobasso, Italy; Department of Oncology, Hospital "Andrea Tortora," ASL Salerno, Pagani, Italy; Department of Oncology and Hematology, AOU Federico II of Naples, Naples, Italy
| | - Silvia Zappavigna
- Department of Precision Medicine, University of Campania "L. Vanvitelli," Naples, Italy
| | - Felice Crocetto
- Department of Neurosciences, Human Reproduction and Odontostomatology, University of Naples Federico II, Naples, Italy
| | - Mario Giuliano
- Department of Clinical Medicine and Surgery, University Federico II of Naples, Naples, Italy; Regional Reference Center for Rare Tumors, Department of Oncology and Hematology, AOU Federico II of Naples, Naples, Italy
| | - Dario Ribera
- Department of Clinical Medicine and Surgery, University Federico II of Naples, Naples, Italy
| | - Rocco Morra
- Department of Clinical Medicine and Surgery, University Federico II of Naples, Naples, Italy
| | - Luca Scafuri
- Department of Clinical Medicine and Surgery, University Federico II of Naples, Naples, Italy
| | - Antonio Verde
- Department of Clinical Medicine and Surgery, University Federico II of Naples, Naples, Italy
| | - Dario Bruzzese
- Department of Public Health, University of Naples "Federico II," Naples, Italy
| | - Simona Iaccarino
- Department of Clinical Medicine and Surgery, University Federico II of Naples, Naples, Italy
| | - Ferdinando Costabile
- Department of Clinical Medicine and Surgery, University Federico II of Naples, Naples, Italy
| | - Livia Onofrio
- Department of Clinical Medicine and Surgery, University Federico II of Naples, Naples, Italy
| | - Martina Viggiani
- Department of Clinical Medicine and Surgery, University Federico II of Naples, Naples, Italy
| | - Alessandro Palmieri
- Department of Neurosciences, Human Reproduction and Odontostomatology, University of Naples Federico II, Naples, Italy
| | - Pietro De Placido
- Department of Clinical Medicine and Surgery, University Federico II of Naples, Naples, Italy
| | | | - Erica Pietroluongo
- Department of Clinical Medicine and Surgery, University Federico II of Naples, Naples, Italy
| | - Amalia Luce
- Department of Precision Medicine, University of Campania "L. Vanvitelli," Naples, Italy
| | - Marianna Abate
- Department of Precision Medicine, University of Campania "L. Vanvitelli," Naples, Italy
| | | | - Vincenzo Francesco Caputo
- Department of Neurosciences, Human Reproduction and Odontostomatology, University of Naples Federico II, Naples, Italy
| | - Giuseppe Celentano
- Department of Neurosciences, Human Reproduction and Odontostomatology, University of Naples Federico II, Naples, Italy
| | - Nicola Longo
- Department of Neurosciences, Human Reproduction and Odontostomatology, University of Naples Federico II, Naples, Italy
| | - Matteo Ferro
- Division of Urology, European Institute of Oncology-IRCCS, Milan, Italy
| | - Franco Morelli
- Medical Oncology Unit, IRCCS Casa Sollievo della Sofferenza, San Giovanni Rotondo, Italy
| | - Gaetano Facchini
- Departmental Unit of Experimental Uro-Andrological Clinical Oncology, Department of Uro-Gynaecological Oncology, National Cancer Institute-IRCCS-G. Pascale Foundation, Naples, Italy
| | - Michele Caraglia
- Department of Precision Medicine, University of Campania "L. Vanvitelli," Naples, Italy; Biogem Scarl, Institute of Genetic Research, Laboratory of Precision Medicine and Molecular Oncology, Ariano Irpino, Italy
| | - Sabino De Placido
- Department of Clinical Medicine and Surgery, University Federico II of Naples, Naples, Italy; Regional Reference Center for Rare Tumors, Department of Oncology and Hematology, AOU Federico II of Naples, Naples, Italy
| | - Carlo Buonerba
- Department of Clinical Medicine and Surgery, University Federico II of Naples, Naples, Italy; Regional Reference Center for Rare Tumors, Department of Oncology and Hematology, AOU Federico II of Naples, Naples, Italy.
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