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Japanese Journal of Cancer Research : Gann logoLink to Japanese Journal of Cancer Research : Gann
. 1999 Feb;90(2):144–153. doi: 10.1111/j.1349-7006.1999.tb00727.x

Urinary Bladder Lesions after the Chernobyl Accident: Immunohistochemical Assessment of p53, Proliferating Cell Nuclear Antigen, Cyclin D1 and p21WAF1/Cip1

Alina Romanenko 1, Chyi Chia R Lee 3, Shinji Yamamoto 3, Taka‐aki Hori 3, Hideki Wanibuchi 3, Wadim Zaparin 2, Wladimir Vinnichenko 2, Alexander Vozianov 2, Shoji Fukushima 3,
PMCID: PMC5926045  PMID: 10189884

Abstract

During the 11‐year period subsequent to the Chernobyl accident, the incidence of urinary bladder cancer in Ukraine has increased from 26.2 to 36.1 per 100,000 population. Cesium‐137 (137Cs) accounts for 80–90% of the incorporated radioactivity in this population, which has been exposed to long‐term, low‐dose ionizing radiation, and 80% of the more labile pool of cesium is excreted via the urine. The present study was performed to evaluate the histopathological features and the immunohistochemical status of p53, p21WAF1/Cip1, cyclin D1 and PCNA (proliferating cell nuclear antigen) in urinary bladder mucos a of 55 males (49‐92 years old) with benign prostatic hyperplasia who underwent surgery in Kiev, Ukraine, in 1995 and 1996. Group I (28 patients) inhabiting radiocontaminated areas of the country, group II (17 patients) from Kiev city with less radiocontamination and a control group III (10 patients) living in so‐called “clean” areas of Ukraine were compared. In groups I and II, an increase in multiple areas of moderate or severe dysplasia or carcinoma in situ was seen in 42 (93%) of 45 cases. In addi tion, two small transitional cell carcinomas were found in one patient in each of groups I and II. Nuclear accumulation of p53, PCNA, cyclin D1, and to a lesser extent p21WAF1/Cip1, was significantly increased in both groups I and II as compared with the control group III, indicating possible transformation events or enhancement of repair activities, that may precede the defect in the regulatory pathway itself, at least in the G1 phase of the cell cycle. Our results suggest that early malignant transformation is taking place in the bladder urothelium of people in the radiocontaminated areas of Ukraine and that this could possibly lead sometime in the future to an increased incidence of urinary bladder cancer.

Keywords: Urinary bladder cancer, Cell cycle, p53, Cyclin D1, p21WAF1/Cip1

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