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Journal of Cancer Research and Clinical Oncology

, Volume 137, Issue 8, pp 1255–1262 | Cite as

Aberrant promoter methylation and inactivation of PTEN gene in cervical carcinoma from Indian population

  • M. Moshahid Alam RizviEmail author
  • M. Shabbir Alam
  • Asgar Ali
  • Syed Jafar Mehdi
  • Swaraj Batra
  • A. K. Mandal
Original Paper

Abstract

Purpose

PTEN, a tumor-suppressor gene located on chromosome 10q23.3 is implicated in multiple tumors including cervical carcinoma.

Methods

We examined 135 cervical cancer specimens for PTEN gene expression and promoter methylation using methylation-specific PCR and immunohistochemistry and also studied the mutation in PTEN gene through PCR-single-stranded conformational polymorphism. PTEN expression and its methylation status were also correlated with clinicopathologic parameters.

Results

The results showed an abnormal band on exon 5 and exon 9 of the PTEN gene. In PTEN gene, 61% specimen showed methylation. PTEN methylation was found in 39% cases of stage I, 60% of stage II, and 75% of stages III–IV. The correlation between PTEN methylation and clinical stage was found to be statistically significant (P = 0.003). Nuclear PTEN expression was detected in 84 of 135 (62%) cases of cervical carcinoma, and the remaining 51 of 135 (38%) cases were observed as expressional loss. The loss of PTEN expression was significantly correlated clinical stage (P = 0.001). Loss of PTEN expression was observed in 34 (41%) cases among 83 methylation positive cases, whereas among 52 methylation-negative cases, only 13 (25%) cases were seen as immunostaining negative with the statistically significant value (P = 0.05).

Conclusion

Promoter methylation and loss of PTEN expression occur frequently in carcinoma of uterine cervix. Our results suggest that PTEN plays an important role in the carcinogenesis of cervical cancer.

Keywords

PTEN Cervical cancer Methylation Immunohistochemistry 

Notes

Acknowledgments

The authors acknowledge University Grants Commission (UGC), Government of India, New Delhi, for providing the fund for this study. The authors also acknowledge Mr. M. Irshad and Mr. Irfan Ahmad for their valuable suggestions during the manuscript preparations.

Conflict of interest

None.

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • M. Moshahid Alam Rizvi
    • 1
    Email author
  • M. Shabbir Alam
    • 1
    • 2
  • Asgar Ali
    • 1
  • Syed Jafar Mehdi
    • 1
  • Swaraj Batra
    • 3
  • A. K. Mandal
    • 4
  1. 1.Genome Biology Lab, Department of BiosciencesJamia Millia Islamia, Maulana Mohammad Ali Jauhar MargNew DelhiIndia
  2. 2.Department of Medical Lab Technology, Faculty of Applied Medical SciencesJazan UniversityJizanKingdom of Saudi Arabia
  3. 3.Department of Obstetrics & GynecologyLNJP/MAMC CampusNew DelhiIndia
  4. 4.Department of PathologyMAMC CampusNew DelhiIndia

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