BMJ  2005;331:1183-1185 (19 November), doi:10.1136/bmj.38663.459039.7C

Primary care

Risk of cervical and other cancers after treatment of cervical intraepithelial neoplasia: retrospective cohort study

¹ Department of Obstetrics and Gynaecology, Helsinki University Central Hospital, Box 140, FIN-00029, Helsinki, Finland, ² Mass Screening Registry, Finnish Cancer Registry, Liisankatu 21 B, FIN-00170, Helsinki, Finland, ³ Finnish Cancer Registry, Liisankatu 21 B, FIN-00170, Helsinki, Finland

Objective To study the long term risk of cervical and other cancers after treatment for cervical intraepithelial neoplasia.

Design Retrospective cohort study.

Setting University Hospital, Helsinki, Finland.

Participants 7564 women treated for cervical intraepithelial neoplasia during 1974 and 2001 and followed up through the Finnish cancer registry until 2003.

Main outcome measures Standardised incidence ratio for cervical cancer and other cancers.

Results During follow-up 22 cases of invasive cervical cancer occurred in women treated for cervical intraepithelial neoplasia (standardised incidence ratio 2.8, 95% confidence interval 1.7 to 4.2). The highest risk was during the second decade (10 cases observed: 3.1, 1.5 to 5.7). The standardised incidence ratio for cervical intraepithelial cancer type 1 was 3.1 (1.4 to 6.2) and for type 2 was 3.7 (0.9 to 10.7).

Conclusions The risk of cervical cancer in the first 20 years after treatment for cervical intraepithelial neoplasia is higher than in the average population. The risk of smoking related cancers is also increased.

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Rapid Responses:

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Is there a correlation between developing cancer and treatment method

C J Geary
bmj.com, 20 Nov 2005 [Full text]

Author's reply

Ilkka Kalliala
bmj.com, 24 Nov 2005 [Full text]

Long-lasting increased risk of cervical cancer after treatment of CIN: explanations and implications for follow-up.

Guglielmo Ronco, et al.
bmj.com, 25 Nov 2005 [Full text]

Re: Long-lasting increased risk of cervical cancer after treatment of CIN: explanations and implications for follow-up.

Ilkka Kalliala, et al.
bmj.com, 14 Dec 2005 [Full text]