Volume 95, Issue 6 pp. 364-369
Research Article

Sensitive detection of transitional cell carcinoma of the bladder by microsatellite analysis of cells exfoliated in urine

Davide Seripa

Davide Seripa

Unità Patologia Molecolare e Terapia Genica, IRCCS H. “Casa Sollievo Sofferenza”, Opera Padre Pio da Pietrelcina, San Giovanni Rotondo, Italy

The first two authors contributed equally to this work.

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Paola Parrella

Paola Parrella

Laboratory of Molecular Medicine and BioTechnology, Università Campus Bio-Medico, Rome, Italy

Department of Otolaryngology—Head and Neck Surgery, Division of Head and Neck Cancer Research, Johns Hopkins University School of Medicine, Baltimore, MD, USA

The first two authors contributed equally to this work.

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Michele Gallucci

Michele Gallucci

Department of Urology, Campus Bio-Medico University, Rome, Italy

Department of Urology, “Cristo Re” Hospital, Rome, Italy

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Carolina Gravina

Carolina Gravina

Unità Patologia Molecolare e Terapia Genica, IRCCS H. “Casa Sollievo Sofferenza”, Opera Padre Pio da Pietrelcina, San Giovanni Rotondo, Italy

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Sara Papa

Sara Papa

Unità Patologia Molecolare e Terapia Genica, IRCCS H. “Casa Sollievo Sofferenza”, Opera Padre Pio da Pietrelcina, San Giovanni Rotondo, Italy

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Pasquale Fortunato

Pasquale Fortunato

Department of Urology, “Cristo Re” Hospital, Rome, Italy

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Antonio Alcini

Antonio Alcini

Department of Urology, Campus Bio-Medico University, Rome, Italy

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Gerardo Flammia

Gerardo Flammia

Department of Urology, Campus Bio-Medico University, Rome, Italy

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Marzia Lazzari

Marzia Lazzari

Department of Surgery, Università di Roma “Tor Vergata”, Rome, Italy

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Vito M. Fazio

Corresponding Author

Vito M. Fazio

Unità Patologia Molecolare e Terapia Genica, IRCCS H. “Casa Sollievo Sofferenza”, Opera Padre Pio da Pietrelcina, San Giovanni Rotondo, Italy

Laboratory of Molecular Medicine and BioTechnology, Università Campus Bio-Medico, Rome, Italy

Fax: +39-882-410575 or +39-882-410794

Molecular Pathology and Gene Therapy Unit, IRCCS-II, “Casa Sollievo della Sofferenza,” Viale Cappuccini, I, San Giovanni Rotondo (FG), I-71013, ItalySearch for more papers by this author

Abstract

Transitional cell carcinoma (TCC) is the most common bladder tumor. Urine cytology can identify most high-grade tumors but sensitivity is lower if one includes lesions of all grades. Microsatellite marker alterations have been found in many tumor types including bladder cancer and have been used to detect cancer cells in body fluids including urine. The aim of our study is to further evaluate feasibility and sensitivity of microsatellite analysis to detect bladder cancer cells in urine. We studied 55 individuals: 21 with symptoms suggestive of bladder cancer, 23 patients with previous history of TCC and 11 healthy subjects. Genomic DNA was extracted from blood lymphocytes, urine sediment, bladder washings and tumor or normal bladder mucosa. Twenty highly informative microsatellite markers were analyzed for loss of heterozigosity (LOH) and microsatellite instability (MIN) by polymerase chain reaction. Microsatellite analysis of urine identified 33 of 34 (97%) patients with either primary or tumor recurrence, whereas urine cytology identified 27 of 34 (79%) patients (p = 0.0001). Detection of microsatellite abnormalities improved the sensitivity of detecting low-grade and/or stage bladder tumor: from 75–95% for grades G1–G2 and from 75–100% for pTis–pTa tumors. Bladder washings from 25 patients were also analyzed, and in all cases results were identical to those obtained from voided urine. None of the 16 patients without evidence of TCC showed LOH and/or MIN in urine samples or bladder washings. Interestingly, in a patient with persistent bladder mucosa abnormalities, microsatellite alterations were demonstrated 8 months before the histopathologic diagnosis of tumor recurrence. These results further indicate that microsatellite marker analysis is more sensitive than conventional urine cytology in detecting bladder cancer cells in urine and represents a potential clinical tool for monitoring patients with low-grade/stage TCC. © 2001 Wiley-Liss, Inc.

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