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Cervical morbidity in Alsace, France

results from a regional organized cervical cancer screening program

Baldauf, Jean-Jacquesa; Fender, Murielc; Bergeron, Christined; Marrer, Emiliee; Velten, Michelb; Pradat, Pierref; Arbyn, Marcg

European Journal of Cancer Prevention: January 2019 - Volume 28 - Issue 1 - p 33–39
doi: 10.1097/CEJ.0000000000000415
Research Papers: Gynecological Cancer

In 1994, a pilot program of cervical cancer screening was introduced in the Alsace region, France. Women aged 25–65 years were proposed to have one Pap smear every 3 years. The objective was to assess cervical morbidity in Alsace before the human papillomavirus vaccinated population reaches the age of screening. Data on cervical lesions and cancers were collected by EVE for the period September 2008 to August 2011 from existing medical services and cytopathology laboratories in Alsace. Cytological and histological data were completed with data from the two cancer registries covering the region (Bas-Rhin and Haut-Rhin). Cancer incidence rates were computed for the target population (truncated to 25–64 years) and were age standardized according to the world reference population. World standardized incidence rates for the whole female population were obtained from the two cancer registries. During 2008–2011, 565 153 smears were performed in 498 913 women aged 25–64 years, representing an average of 1.13 smears/woman and 1.62 smears/screened woman. The overall screening coverage was 70.1% over the 3-year period. Histologically confirmed high-grade lesions were found in 2303 women (0.5%). Moreover, 215 cervical cancers were reported among women aged 25–64 years (crude and standardized truncated incidence rate of 10.6 and 10.0/100 000 women-years, respectively). The overall screening coverage of 70% at 3 years is higher than the national rate (57%), and the overall cancer incidence of 5.5/100 000 is below the national French level. The EVE database will be useful to assess trends in cervical morbidity over time and to further assess the effect of screening as well as of human papillomavirus vaccination.

aDepartment of Obstetrics and Gynecology, CHU Hautepierre

bDepartment of Epidemiology and Public Health, Bas-Rhin Cancer Registry, University of Strasbourg, Strasbourg

cAssociation EVE, Illkirch Graffenstaden

dCerba Laboratory, Cergy Pontoise

eHaut-Rhin Cancer Registry, Mulhouse Hospital, Mulhouse

fDepartment of Hepatology, Centre for Clinical Research, Croix-Rousse Hospital, Hospices Civils de Lyon, Lyon, France

gBelgian Cancer Centre/Unit of Cancer Epidemiology, Scientific Institute of Public Health, Brussels, Belgium

Correspondence to Jean-Jacques Baldauf, MD, PhD, Department of Obstetrics and Gynecology, CHU Hautepierre, Avenue Molière, 67098 Strasbourg Cedex, France Tel: +33 388 127 472; fax: +33 388 127 457; e-mail:

This is an open-access article distributed under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives License 4.0 (CCBY-NC-ND), where it is permissible to download and share the work provided it is properly cited. The work cannot be changed in any way or used commercially without permission from the journal.

Received December 12, 2016

Accepted July 5, 2017

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Cervical cancer is one of the most common cancers occurring in women worldwide with 485 000 cases diagnosed in 2013 and 236 000 deaths (Fitzmaurice et al., 2015). Its association with human papillomavirus (HPV) is now well established (Tommasino, 2014), and effective HPV vaccines are today available and recommended as a primary prevention measure (Bosch et al., 2013). However, cervical cancer screening still remains necessary. In spite of European guidelines (Arbyn et al., 2010), cervical cancer prevention differs between countries or regions and screening may be either organized or opportunistic (Elfström et al., 2015a, 2015b). In France, smears are recommended in women aged 25–65 years once every 3 years following two negative smear results performed at 1-year interval (Anon, 1990). However, it is estimated that 40% of French women have never had a cervical smear test, and this rate increases up to 80% in women older than 60 years (Eisinger et al., 1994).

In Alsace, a French region of ∼1.8 million inhabitants, a pilot program of cervical cancer screening was introduced in 1994 in the Bas-Rhin Department and extended to the whole Alsace region in 2001 (Fender et al., 1998). The objectives of this program are to increase screening coverage and to ensure high quality at every step of the screening process using existing health services. Organized screening programs may also help to better estimate the burden of cervical lesions within a given well-defined geographical area (Arbyn et al., 2009).

The objective of this study was to assess, within the context of an organized cervical cancer screening program, cervical morbidity in Alsace before the vaccinated population reaches the age of screening.

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Materials and methods

Study period and geographical scope

Data on cervical lesions and cancers were collected for the period September 2008 to August 2011. The data collection covered the Alsace region including the two departments of Bas-Rhin and Haut-Rhin. In 2011, 498 913 women aged 25–65 years, resident of Alsace, belonged to the target population eligible for a screening Pap smear. The burden of cervical lesions in the study period was only slightly influenced by HPV vaccination. HPV vaccination was recommended in France since 2007 for 14-year-old girls and for 15–23-year-old women (as part of ‘catch-up’ vaccination), and since 2013 for 11–14-year-old girls with a catch-up for 15–19-year-old women. A recent HPV vaccination coverage study conducted by EVE, based on reimbursement data, showed that ∼4% of women in the target screening population may have been vaccinated (Baldauf JJ, unpublished data).

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Organized cervical cancer screening in Alsace

Cervical cancer screening is offered by existing medical services. Data were obtained from all cytopathology laboratories in Alsace. Cytological data were collected since 1994 (Bas-Rhin) and 2001 (Haut-Rhin), whereas histological data were available from the laboratories of both departments since 2007. Before 2007, histological data were obtained from physicians who provided the follow-up of abnormal Pap smear results. Data were centralized and managed by the EVE association sponsored by National Educational and Health Information Funds (FNPEIS) and by the local councils (Anon, 2016a). The Alsace screening program checks records from the French National Health Services and invites women who do not have a Pap smear recorded within the previous 3 years. The central database allows tracking the follow-up of women with abnormal smears. Cytological lesions are classified according to the 2001 Bethesda classification (Solomon et al., 2002) and histological lesions according to the WHO classification (Anon, 2017). Screening in Alsace is organized taking the European guidelines for Quality Assurance of Cervical Cancer Screening into account (Arbyn et al., 2010).

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Cancer registries

Cytological and histological data are completed with data from two population-based cancer registries of Bas-Rhin and Haut-Rhin. These registries allow the identification of cancer cases diagnosed inside and outside the screening program hereby contributing to more complete data.

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Statistical analysis

Population data used for calculations of the burden of disease were extracted from the National Institute of Statistics and Economic Studies (INSEE) (Anon, 2011). Five-year age groups were constructed on women’s age in 2011. Screening coverage was defined as the proportion of 25–64-year-old women residing in Alsace in 2011 with at least one Pap smear in the 3 or the 5 previous years.

The burden of lesions was described by absolute numbers and as proportions. For cytology, the percentage of abnormal Pap smears was computed, whereas prevalence of histological lesions was calculated as number of women with cervical intraepithelial neoplasia detected during the study period (selecting highest degree of lesion occurring in the 3-year period/population screened×1000). The truncated incidence of cancer is expressed as new cases of invasive cancer per 100 000 women-years in the target study population. Age-standardized incidence rates were computed as proposed by Jenssen et al. (1991), using the World standard population as reference [world standardized incidence rate (WSIR)]. The truncated WSIR was computed from the database, whereas the WISRs including all age groups were obtained from the Cancer Registries of Bas-Rhin and Haut-Rhin (Anon, 2016b).

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Cytopathology classifications

CIN2+ (cervical intraepithelial neoplasia of grade 2 or worse) was defined as CIN2, CIN3, or adenocarcinoma in situ (Richart, 1973), whereas ASC-US+ was defined as ASC-US (atypical squamous cells of undetermined significance)+ASC-H (atypical squamous cells cannot exclude HSIL)+AGC (atypical glandular cells)+LSIL (low-grade squamous intraepithelial lesion)+HSIL (high-grade squamous intraepithelial lesion)+cytological findings compatible with adenocarcinoma in-situ or cancer. Finally, ASC-H+ was defined as ASC-H+HSIL+cytological findings compatible with adenocarcinoma in-situ or cancer (Solomon et al., 2002).

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Ethical considerations

In accordance with the French legislation, the Alsace screening program received approval from the Commission Nationale de l’Informatique et des Libertés (CNIL) (Anon, 2016c) (agreement no. 289520 received on 23 January 1993, modified on 16 March 2005, 17 November 2010, and 9 February 2011). All screened women received information on collection and linkage of relevant screening data and on their right to refuse the use of their personal data.

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Target population

In 2011, 498 913 women aged 25–64 were living in the Alsace region. The age distribution is given in Supplementary Table 1 (Supplemental digital content 1,

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Number of Pap smears and screening coverage

The total number of smears per age category is given in Supplementary Table 1 (Supplemental digital content 1, For the whole Alsace region, 565 153 smears were performed during the 2008–2011 period in 498 913 women, representing an average of 1.13 smears/woman living in Alsace and 1.62 smears/screened woman. This latter ratio varied by age decreasing from about 2.05 in women aged less than 30 to 1.33 in women over 60 years.

The overall screening coverage was 70.1% over the 3-year period and varied by age. It increased from 63.4% in women aged 25–29 to 83.4% in women aged 30–34 and then decreased regularly to 56.7% in 60–64-year-old women (Fig. 1). The overall screening coverage rate considered over a 5-year period was 81.3%.

Fig. 1

Fig. 1

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Cytological lesions

During the 2008–2011 period, 8180 smears were classified as low-grade lesions (LSIL) representing a prevalence of 1.45/100 smears (Supplementary Table 2, Supplemental digital content 2, This prevalence was 3.04% in the 25–29 age group and decreased to 0.41% in women aged 60–64 years (Fig. 2).

Fig. 2

Fig. 2

In the same period, 1690 smears were classified as high-grade lesions (HSIL) with an overall prevalence of 0.30/100 smears, decreasing from 0.51% in 25–29-year-old women to 0.08% in women 60–64 years old. Five smears were suggestive of adenocarcinoma in situ and 73 smears were suggestive of invasive cervical cancer. Among them, 24 were suggestive of squamous carcinoma, 13 of adenocarcinoma, and 36 of unspecified cervical cancer. Overall, 535 378 smears (94.7%) were considered as within normal limits.

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Histologically confirmed cervical intraepithelial neoplasia

Over the 3-year period, 2664 cases of CIN1, 962 CIN2, and 1283 CIN3 were reported, representing a prevalence of 5.34/1000, 1.93/1000 and 2.57/1000 screened women, respectively. The world standardized prevalence of CIN1, CIN2, and CIN3 was 6.11/1000 (95% confidence interval: 5.87–6.34/1000), 2.19/1000 (2.05–2.33/1000), and 2.92/1000 (2.76–3.09/1000), respectively. The prevalence of these lesions was highest in younger women (25–29 years) and lowest in women aged 60–64 years (Table 1). Fifty-eight cases of adenocarcinoma in-situ (AIS) were reported giving a prevalence of 0.12/1000.

Table 1

Table 1

Table 2 gives the proportion of CIN2+ lesions among all cytological lesions (ASC-US+) and among ASC-H+ (ASC-H, HSIL, or adenocarcinoma in-situ or cancer). Approximately 8.4% of all smears with cytological lesion (ASC-US+) turned to be CIN2+ whereas 88.6% of smears evocating a high-grade lesion (ASC-H+) turned to be CIN2+.

Table 2

Table 2

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Cancer cases

For the whole Alsace region, 215 cervical cancers were reported during the 2008–2011 period, giving a crude incidence rate of 10.6/100 000 women-years in the target age group (25–64 years) (Table 3). The world standardized incidence, restricted to the study target population, was 10.0/100 000 women-years (8.6–11.3/100 000). The incidence increased from 3.2/100 000 in women aged 25 to 29 years, to ∼15.0/100 000 in women between 40 and 54 years, and decreased after 55 years reaching 8.3/100 000 in 60–64-year-old women. These cancers were mainly squamous carcinomas (78%). Among 204 cases of squamous carcinoma or adenocarcinoma, 30% were detected in women who had a smear during the past 3 years.

Table 3

Table 3

The world age-standardized incidence rates of cervical cancer for all age groups reported by the cancer registries of Bas-Rhin and Haut-Rhin for the period 2008–11 were 5.3 and 5.6/100 000 women-years, respectively (Anon, 2016b).

For cytological and histological lesions as well as for cancers, no difference was observed in terms of prevalence/incidence between the Bas-Rhin and Haut-Rhin departments (data not shown), and data were thus pooled together, representing the whole Alsace region.

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Based on an organized and long-lasting cervical cancer screening program, our study gives an overview of cervical morbidity in Alsace between 2008 and 2011. The overall screening coverage of 70% at 3 years is higher than the national screening coverage rate (57% during 2006–2008) (Anon, 2016d) but remains below the recommended European coverage of 85% (Coleman et al., 1993). Such a high rate is only achieved among 30–34-year-old women (84.7%) whereas rates of ∼60% are observed in younger women (25–29 years) and in women older than 55 years. Even if a general trend toward lower coverage in young women has been reported in other developed countries (Lancucki et al., 2010), the coverage in younger women in our study (25–29 years) is underestimated as not all women had the opportunity to contribute over the whole study period. For example, women who were 25 years old in 2011 only contributed over 1 year of the study period (2011). It is noteworthy that the overall screening coverage rate increases from 70 to 83% when considering a 5-year interval. This underlines the benefit of an organized screening program with systematic reminding for women with no smear during the past 3 years (Heranney et al., 2011).

The average number of smears of 1.62/screened woman is excessive to cover the whole population suggesting a substantial amount of over screening. The average ratio of 1.62 varies according to age, with highest values in the younger and lowest values in the older target age groups. The higher ratio of 2.05 observed in the 25–29 age group is explained by the French guidelines which specify that the first screening smear must be repeated at 1 year before spacing at 3 years.

The overall screening coverage rate of 70% reflects the strength of this organized screening program which should be extended to other regions in France. However, the amount of over screening merits attention as this activity involves substantial resources without proven benefit but with associated adverse effects (Thiery et al., 2017). Restriction of reimbursement of screening according to recommended screening intervals implemented in Belgium was successful in reducing excessive Pap smear use (Arbyn et al., 2014). In France, a first step was taken by changing the coding system for reimbursements of acts, now allowing the distinction between screening smears and follow-up smears. However, the new national screening guidelines are still not mentioning that over screening is not reimbursed.

HPV vaccination is recommended in France since 2007 for 14-year-old girls and for 15–23-year-old women (as part of ‘catch-up’ vaccination), and since 2013 for 11–14-year-old girls with a catch-up for 15–19-year-old women. Therefore, no influence was expected during this study which covered the 2008–2011 period as almost all women vaccinated since 2007 could not be included because of their age. These results of the ‘prevaccination’ period will be a reference to assess the effect of routine HPV vaccination on the burden of cervical lesions in France when vaccinated cohorts reach the target age for screening.

Since the first historical histological study on cervical lesions in France (Sastre-Garau et al., 1996), a recent study conducted by the FRANCIM network (France Cancer Incidence et Mortalité) reported data on the burden of cervical lesions in nine different departments of France (20% of the French population) between 2000 and 2009 (Woronoff et al., 2017), but using limited data regarding the classification of CIN (Richart, 1990). Indeed since the recommended use of the CIN classification for cervical lesions in France, some registries merged the different classes of CIN, more particularly CIN2 and CIN3. To face this discrepancy, the authors revised all the registries and decided to take only CIN3 into account. They found 10 879 cervical lesions (CIN3) and 3562 related cancers between 2000 and 2009, with a mean yearly incidence rate of CIN3 ranging from 0.26/1000 in 2000 to 0.30/1000 in 2009, with a significant increase of 2% every year. They also showed that the incidence rate during 2007–2009 varied between the different departments covered by the study, from 0.17 to 0.42/1000/year. These variations may reflect geographical differences regarding the prevalence of risk factors but also differential participation of risk groups, and variation in exhaustivity of registration and sensitivity of screening and diagnosis of cervical precancer (Murthy and Mathew, 2000). Such geographic variations have also been observed between the different states of the USA (Anon, 2016e). The incidence data presented by Woronoff et al. (2017) including the total female population cannot be compared with the prevalence data restricted to women aged 25–64 years in the current report, given the differences in definition and computation of the indicators. The incidence rates presented by Woronoff et al. (2017)showed that the incidence of CIN3+ for Bas-Rhin (0.39/1000) and Haut-Rhin (0.26/1000) were, respectively, higher and lower than the overall average for all French registries (0.30/1000).

Interestingly, we observed that 8% of abnormal smears (ASC-US+) and 89% of smears evocating high-grade cytological lesion (ASC-H+) turned to be CIN2+ lesion representing positive predictive values of 8 and 89%, respectively.

National (Anon, 2016f) and international (Arbyn et al., 2011) estimates of the age-standardized rates (ASIR) of cervical cancer incidence in France around 2008 are similar (7–8/100 000 women-years) when using the world standard population as reference. With this burden, France ranks in the lower quarter of countries in Europe (ranked by increasing burden), where the ASIR varies between 3.7 (Finland) and 23.9/100 000/year (Romania) (Arbyn et al., 2011). The cervical cancer incidence rate in our study (10.6/100 000 women) is computed for women aged 25–64 years. The WSIRs of cervical cancer for the whole female population of Bas-Rhin and Haut-Rhin for the study period (5.3 and 5.6/100 000 women-years, respectively) were lower than the incidence estimated from nine French registries, which was 6.2/100 000 (Woronoff et al., 2014), and lower than the national incidence of 6.8/100 000 estimated in 2010 (Binder-Foucard et al., 2014). As screening coverage in Alsace is higher, and as primary risk of cervical cancer probably is not substantially different in Alsace, lower cancer rates may reflect higher program effectiveness compared with other French regions.

In the present study, 30% of invasive squamous carcinomas or adenocarcinomas were detected in women with regular screening, that is, in women who had at least one smear during the past 3 years. Such cases may represent interval cancer cases, that is, cancers following a normal smear performed within the past 3 years. They may also represent cancer cases associated with an abnormal smear. In this latter situation, it is possible that women with abnormal smear had no follow-up biopsy or that a diagnosis or therapeutic failure occurred (Andrae et al., 2008). It is noteworthy that an increased screening coverage is expected to result in an overall decreased number of cancer cases in women with suboptimal screening which is paralleled with an increased proportion of interval cancer cases. However, these latter cases are known to be less severe than noninterval cases (Andrae et al., 2008 ; Gök et al., 2011).

The Alsace has pioneered organized cervical cancer screening in France, which has led to high population coverage and lower burden of cervical cancer compared with other regions. The Alsace screening and pathology databases demonstrate how trends evolved in relation to screening parameters. These databases – if linked to vaccination registries – will also allow monitoring the effect of HPV vaccination in the future (Pollock et al., 2014 ; Arbyn et al., 2016).

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Conflicts of interest

The work of J-J.B., M.F., C.B., and P.P. was supported in part by a non-conditional grant from Sanofi-Pasteur MSD France (Lyon). M.A. was supported by the Seventh Framework Program of the Directorate-General for Research and Innovation of the European Commission through the COHEAHR network (grant 603019) and by the Joint Action on Comprehensive Cancer Control, which has received funding from the European Union within the framework of the Health Program (2008–2013).

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cervical cancer; incidence; morbidity; screening

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