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Expression of CDC25A and CDC25B phosphatase proteins in human retinoblastoma and its correlation with clinicopathological parameters
  1. Lata Singh1,
  2. Neelam Pushker2,
  3. Seema Sen1,
  4. Mithalesh Kumar Singh1,
  5. Sameer Bakhshi3,
  6. Bhavna Chawla2,
  7. Seema Kashyap1
  1. 1Department of Ocular Pathology, Dr. R. P. Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi, India
  2. 2Department of Ophthalmology, Dr. R. P. Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi, India
  3. 3Department of Medical Oncology, IRCH, All India Institute of Medical Sciences, New Delhi, India
  1. Correspondence to Professor Seema Kashyap, Department of Ocular Pathology, Dr. R. P. Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi, India; dr_skashyap{at}hotmail.com

Abstract

Background CDC25 proteins play a pivotal role in controlling cell proliferation during development and tumorigenesis. The aim of the study is to elucidate the role of CDC25A and CDC25B proteins in retinoblastoma and their association with the clinical and histopathological parameters.

Methods One hundred and nine prospective cases of primary enucleated retinoblastomas were included in the present study. Expression of CDC25A and CDC25B proteins was investigated by immunohistochemistry, western blotting and mRNA expression by reverse-transcriptase PCR.

Results Immunohistochemistry showed CDC25A expression in (57/109) 52.29%, whereas CDC25B expressed in (69/109) 63.30% cases. Western blotting confirmed the immunoreactivity results on representative cases. mRNA expression of CDC25A and CDC25B was found in 29/60 (48.33%) and 35/60 (58.33%) cases, respectively. Expression of CDC25A and CDC25B showed significant correlation with poor tumour differentiation and tumour invasion (p<0.05). There was a statistically significant difference in the overall survival of patients with CDC25B expression (p=0.0270).

Conclusions Our results suggest that expression of CDC25B may be used as a potential prognostic marker in the pathogenesis of retinoblastoma. These findings demonstrate an important role of CDC25 phosphatase proteins and inhibition of these proteins may have therapeutic potential in retinoblastoma.

  • Pathology

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