Comparison of lifestyle, hormonal and medical factors in women with sporadic and lynch syndrome-associated endometrial cancer: A retrospective case-case study
- Authors:
- Published online on: April 6, 2017 https://doi.org/10.3892/mco.2017.1211
- Pages: 758-764
Abstract
Introduction
Lynch Syndrome (LS), also called hereditary non-polyposis colorectal cancer (HNPCC), is a dominantly inherited cancer predisposition syndrome caused by germline mutations in the DNA mismatch repair (MMR) genes, MLH1, MSH2, MSH6, and PMS2. In addition to the early occurrence of colorectal cancer (CRC), LS is also characterized by certain extracolonic cancers (ECCs), of which EC is the most common (1). The lifetime risk of EC varies between 32 and 60%, according to previous studies (2–4). Inactivation of the LS genes leads to loss of MMR proteins and results in microsatellite instability (MSI), which is typical for LS-associated EC. MSI is present in 64% of LS-associated EC tumors, and only in 15% of sporadic EC tumors (5–7).
The common risk factors for EC in the general population, i.e. in non-carriers of MMR mutations, have been well-characterized in several studies: The EC risk rises by nulliparity, obesity, hypertension, high blood glucose levels, ovulation failure, non-use of hormonal contraceptives, estrogen use, estrogen-producing tumors and use of tamoxifen (8,9). Few studies have correlated MMR expression with body mass index (BMI), lifestyle habits and medical history in unselected EC, suggesting an association between lower BMI and a loss of MMR expression (10–12). However, data are limited on lifestyle, hormonal and medical factors in mutation-verified LS-associated EC. Previous studies reporting BMI in EC-affected LS women have elicited contradictory results (13–16).
The aim of the present study was to characterize lifestyle factors and the medical and reproductive history, in EC-affected verified LS mutation carriers and in sporadic EC patients having no familial history of cancer.
Materials and methods
Study subjects
The present retrospective case study was performed at Tampere University Hospital (TAUH), Tampere, Finland. The study protocol was approved by the TAUH Ethical Committee. The study population consisted of Finnish female LS mutation carriers diagnosed with EC in eight Central and five University Hospitals across Finland between January 1992 and December 2010 (Table I). All LS patients with EC tested positive for germ-line mutations associated with LS between January 1996 and December 2009, and this Finnish LS registry has been previously characterized (9). The distribution of different germ-line mutations among LS EC patients (n=50) was as follows: MSH2, 8 patients (16%); MLH1, 39 patients (78%); and MSH6, 3 patients (6%).
The control population consisted of Finnish women with sporadic EC treated at Tampere University Hospital between January 2002 and December 2009 showing no familial history of cancer. Questionnaires addressing reproductive and medical history were mailed to 78 LS and 290 sporadic EC patients. Questionnaires were re-sent to patients who did not return questionnaires in 6 months from the first mailing. Finally, data from the returned questionnaires were collected from a total of 50 LS and 110 sporadic EC patients. All participants in the present study provided their informed consent.
Questionnaires
Participants in the study were recruited to complete a questionnaire collecting data on height, present weight and weight at the ages of 18 and 40 years, parity, number of abortions and miscarriages, age at menarche and menopause, history of ovulation failure, polycystic ovaries and endometriosis, use of hormone replacement therapy (HRT) and hormonal contraception, smoking habits, alcohol consumption, history of other types of cancer and chronic illnesses. A detailed description of the questionnaire content is presented in Table II.
Statistical analysis
IBM SPSS statistics software, version 22 (IBM SPSS, Inc., Armonk, NY, USA) was used for the statistical analyses. BMI, alcohol consumption, the cumulative number of smoked cigarettes as pack-years, number of deliveries, number of induced and spontaneous abortions, age at menarche and menopause, and the duration of HRT or contraceptive use were statistically compared among patients with LS and sporadic EC. The comparison of means was performed using Student's t-test, and comparison of categorical variables (induced and spontaneous abortions) was performed using a Chi-square test. The prevalence of ever use of HRT or hormonal contraception, ever smoking, endometriosis, ovulation failure, diabetes mellitus (DM), atherosclerosis, hypercholesterolemia, hypertension and hypothyreosis was compared among patients with LS and sporadic EC using a Chi-square test. The prevalence of gastrointestinal tract, urinary tract, breast and ovarian cancer (OC) types was also compared among patients with LS and sporadic EC using a Chi-square test. Two-tailed P<0.05 values were considered to indicate statistically significant differences.
Results
Questionnaire response rates were 67 and 38% among patients with LS and sporadic EC, respectively. The mean age of the patients at the time of EC diagnosis was 49.2 (range, 36–66) and 55.6 (range, 42–72) years among patients with LS and sporadic EC, respectively (P<0.0001). Patients with LS and sporadic EC at the time of the survey were also significantly younger compared with their sporadic EC counterparts (mean age, 65.0 vs. 72.4 years; P=0.0001). The mean BMI values reported in the survey at the ages of 18 or 40 years were similar, as was the proportion of overweight patients (reporting a BMI >25) among mutation carriers in comparison with sporadic EC patients.
Self-reported lifestyle habits, including smoking and alcohol consumption, did not differ among patients with LS and sporadic EC.
Reproductive factors appeared to be similar among the study and control patients, with the exception of the number of spontaneous abortions and the use of hormonal contraception. Only 10% of the patients with LS and sporadic EC reported one or more spontaneous abortions compared with 24% of sporadic EC patients (P=0.043), and the ever use of hormonal contraception was more frequent among mutation carriers compared with sporadic EC women (56.0 vs. 32.7%; P=0.004).
LS women seemed to use HRT more frequently in the survey responses compared with sporadic EC patients (16.0 vs. 6.3%; P=0.05), although in the logistic regression analysis, only a younger age in the survey among LS women remained as a significant co-variant.
A total of 16% of the patients with LS and sporadic EC, and 8.1% of the sporadic EC patients had been diagnosed with endometriosis (P=0.137). Self-reported prevalence of chronic illnesses, including hypertension, atherosclerosis, DM, hypothyreosis and hypercholesterolemia, was similar among patients with LS and sporadic EC. The prevalence of gastrointestinal tract cancer (48 vs. 0%; P<0.0001), urinary tract cancer (12 vs. 2%; P=0.006) and OC (6 vs. 0.01%; P=0.056) was higher among LS patients in comparison with sporadic EC patients.
Comparisons of BMI, lifestyle habits, reproductive history, prevalence of chronic illnesses, hormonal therapy use and history of cancer among the patients with LS and sporadic EC are summarized in Tables III–VI.
Discussion
In the present case study, data on self-reported reproductive and medical histories in verified LS mutation carriers in comparison with sporadic EC patients are reported. According to these results, co-morbidity and prevalence of lifestyle-associated factors appeared to be comparable among patients with LS and sporadic EC. However, ever use of hormonal contraceptives was more common among mutation carriers, who also reported having fewer spontaneous and induced abortions compared with their sporadic counterparts. Furthermore, a trend of higher prevalence of endometriosis among mutation carriers was detected. As expected, GI-tract, urogenital tract and ovarian malignancies were more frequent among LS mutation carriers.
Previously published studies describing BMI or environmental factors in suspected LS populations have presented contradictory results. These studies have suggested that EC women with a family history of CRC or suspected LS appear to be obese less often compared with EC women with no CRC family history (14–18). However, Lynch mutation carriers with EC have also been reported to be more obese compared with women with sporadic EC (16), whereas others (13) have reported no significant difference in BMI between these two patient groups, which is in line with the results presented in the current study. Even though our LS cohort included only 50 EC cases, all of them were verified germline MMR gene mutation carriers, and in comparison with previous descriptive studies, the cohort was relatively large.
Several studies of unselected EC cohorts have revealed a positive association between MSI or MMR protein expression positivity and a higher BMI and older age at the time of EC diagnosis (10–12). However, these previous studies have used indirect measurements of LS (i.e., absent MMR protein expression or MSI) instead of germline mutation testing. Consistently with previous studies (14,16), no differences in the prevalence of DM or other chronic illnesses between the study groups were identified in the current study. With regard to BMI and other co-morbidities, the similarities between LS and sporadic EC patient cohorts may imply that sporadic and hereditary EC patients share a common risk factor profile. However, such conclusions cannot be drawn from the type of data presented in the current study.
To date, only two comprehensive retrospective cohort studies of verified LS populations have been published with regard to EC risk (19,20). According to these studies, risk factors are partially shared in sporadic and hereditary EC, since the BMI appeared not to have an effect on EC risk, although parity, longer use of hormonal contraceptives and a later age at menarche reduced the risk of EC in LS women (19,20). It has been suggested that LS women have more non-endometrioid tumors compared with sporadic patients, which could at least partly explain certain of the differences in the reported risk factor profiles (19–21).
LS mutation carriers in the present study used hormonal contraceptives more frequently than non-carriers. This may reflect EC risk-reducing strategies recommended for mutation carriers, or improved standards of advisory family planning. Only a few studies have previously addressed the influence of contraceptive use on ECC risk among LS women (13,19). No significant effect of contraceptive use on the ECC risk was detected among MLH1 mutation carriers in the study of Blokhuis et al (13), although that study included only 12 cases of EC in 87 mutation-positive females, in comparison with 121 mutation-negative female relatives. However, the previously described large retrospective cohort study revealed a marked EC risk reduction among LS mutation carriers with a history of contraceptive use extending to 1 year (19). The results of the present study, demonstrating fewer spontaneous and induced abortions among mutation carriers, may also be interpreted as more premeditated family planning being carried out for the LS mutation carriers tested at a fertile age, and this warrants further investigation.
LS women reported endometriosis two times more frequently than sporadic EC patients. However, the present study was not able to detect statistically significant associations between more frequent diagnosis of endometriosis and LS-associated EC. It is intriguing to speculate that genetic factors conferring EC predisposition may also be partly involved in the pathogenesis of endometriosis. LS women also have an increased risk for OC, as also demonstrated in the present case study and, more specifically, for endometrioid OC and the clear-cell type of OC (2). Endometrioid and clear-cell OC are speculated to possibly originate from endometriotic foci undergoing a malignant transformation (22). Notably, a small series of LS prophylactic surgery specimens revealed endometriosis in up to 20% of samples (23). Taken together, this interesting finding of possible association of LS with endometriosis warrants future studies at a larger scale.
There were limitations to our study. First, the study was descriptive and did not provide data on actual environmental EC risk factors for genetically predisposed LS women, but nevertheless produced qualitative data on features of sporadic and hereditary EC cohorts. As anticipated, the response rate was markedly higher among LS mutation carriers, and this may have introduced bias into the analysis. The positive family history and verified mutation status may be associated with a higher participation rate and a more positive attitude towards questionnaire studies. EC patients with LS were younger than sporadic patients at the time of diagnosis and at the time of the survey, which could have had an influence on the distribution of time-dependent factors, and this should be taken into account when interpreting the results. The data were only collected from EC survivors, and self-reported retrospective data were based on patients' memory. This may have led to bias and under-reporting. However, it has been demonstrated that, for example, weight measures based on patients' memory actually correlate well (24).
In conclusion, the present case study has reported on self-reported reproductive and medical histories in verified LS mutation carriers compared with sporadic EC patients. The BMI, co-morbidity and lifestyle-associated factors appeared to be comparable between LS and sporadic EC patient cohorts. Ever use of hormonal contraceptives was more common among mutation carriers, and they appeared to have undergone fewer spontaneous and induced abortions. These findings may reflect more premeditated family planning in LS mutation carriers tested for mutations at a fertile age, providing an interesting target for future research. A trend of higher prevalence of endometriosis among mutation carriers was also detected, similarly warranting further investigation at a larger scale.
Acknowledgements
This study was funded by the Finnish Cancer Society and Competitive Research Funding of the Tampere University Hospital (grant no. 9S040).
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