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Rectal cancer in Luxembourg : a national population-based data report, 1988–1998

BMC Cancer volume 3, Article number: 27 (2003) Cite this article

Abstract

Background

Morphologic criteria which might help to support the need for a preventive strategy for early detection of rectal cancer were analysed. Population-based data on rectal adenomas with high-grade dysplastic changes (n = 199) and invasive adenocarcinomas (n = 912) registered by the national Morphologic Tumour Registry (MTR) and diagnosed in a central department of pathology in Luxembourg between 1988 and 1998 were considered.

Methods

The analysis concerned time trends in frequency, crude incidence, tumour-stage, the rectal "high-grade" adenoma/invasive adenocarcinoma-ratio and the survival rates. Histopathological tumour-stage parameters (UICC/AJCC, 1997) in a consecutive series of 641 resected rectal cancers and their relationship with the observed patient survival are investigated.

Results

The majority of invasive adenocarcinomas are diagnosed at a late stage (i.e. Stage II and III) into contrast with the highly significant increase (355 %) in frequency of rectal high-grade adenomas (Stage 0). During the two-time periods 1988–1992 and 1994–1998 Stage I and Stage IV-cases decreased by 11 % and 47 % respectively. Tumour-stage correlates with prognosis. The rectal high-grade adenoma / invasive adenocarcinoma-ratio improved significantly over the last five years.

Conclusion

Over the study period, there has been a highly significant rise in the incidence of resected rectal adenomas with high-grade intraepithelial neoplasia. The ratio of early tumours to invasive cancers has risen while the numbers of colonoscopies and rectoscopies remained unchanged respectively decreased. As the number of advanced tumour-stages remained stable, mass-screening procedures focusing on the fifty to sixty age group should be reinforced.

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Introduction

As described by the TNM-system and confirmed by many multivariate analyses the prognosis of patients after tumour-resection for cure (R0) of colorectal cancer (CRC) is predominantly influenced by the anatomical extend of cancer [1–9].

In view of a national CRC-screening pilot-project, the authors have collected descriptive epidemiological data of the rectal cancer (i.e. frequency, crude incidence, age distribution, age standardized incidence rates, tumour-stage, residual tumour tissue, number of the senior surgeons involved, number of colonoscopies realized, number of rectoscopies, mortality rates) for different time spans in the Grand-Duchy of Luxembourg (Western Europe).

Evaluating the data from the period 1988–1998, arguments and criteria to develop an alternative strategy for early detection of colorectal cancer in a defined area (Luxembourg) with a 'liberal' medical care system and without academic medical institutions have to be looked for.

Methods

Between January 1rst 1988 and December 31 1998 the Morphologic Tumour Registry (MTR) in Luxembourg registered 199 new cases of rectal "high-grade" adenomas and 912 new consecutive cases of invasive rectal adenocarcinomas in a population increasing from 374,900 in 1988 to 429,200 in 1998, an average increase of 1.3% per year [10–12]. The registration of rectal high-grade adenomas and invasive adenocarcinomas diagnosed by 9 pathologists in the only department of pathology in the country is mandatory. In this study patients of all nationality living in Luxembourg were evaluated. Only new primary tumours were considered. Recurrent disease, synchronous or metachronous adenomas or adenocarcinomas, mesenchymal malignant tumours, epidermoid tumours of the anorectal junction, metastatic lesions and high-grade adenomas at the same site were excluded the latter being considered separately. The rectal cancers (RC) were removed by 45 senior surgeons.

Excluding invasive cancers diagnosed only by biopsy, there were 694 surgical specimens allowing an interpretation in function of the tumour depth of penetration of the rectal wall (pT) [1–3, 9, 13]. In analogy to the former original Dukes-System 641 surgical resection specimens permited an analysis in relation to the lymph node-status by the tumour-stage (Stage I to IV) supported by the Union International Contre le Cancer (UICC) and the American Joint Committee on Cancer (AJCC) [1–4, 14]. So the stratification by stage (Table 1) required the exclusion of patients diagnosed by biopsy forceps only, patients who underwent only polypectomy without segmental resection or rectal amputation and patients with known preoperative non-surgical, debulking treatments. By this way an evaluation of our data in relation to the evaluable presence or absence of lymph nodes (i.e. polypectomy, transanal resection versus classic amputation) could be realized.

Table 1 Tumour-stage classifications and equivalences Dukes (1932) – TNM/UICC-AJCC (1987, 1992, 1997) 1–4,14
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The R-classification was performed by conventional methods [3–9] and focused on the loco-regional extend. The different categories were defined as follows:

Rx = presence of residual tumour cannot be assessed; R0 = no residual tumour; R1 = microscopically residual tumour; R2 = macroscopically residual tumor [1].

To evaluate the survival rates in relation to the anatomical extent 203 patients with RC only diagnosed by biopsy without surgical resection had to be excluded previously and were subject of a separate analysis.

The histopathological diagnoses of all lesions were realized following the WHO-classification [15]. According to the WHO-recommandations, we defined "high-grade" adenomas as adenomas of tubular, villous or tubulo-villous histological type with high-grade intraepithelial neoplasia (i.e. dysplasia) [15, 16]. This category includes, in analogy to the pTis-class or stage 0 of the TNM-System, cancer cells confined within the glandular basement membrane (intraepithelial) or lamina propria (intramucosal) with no extension through muscularis mucosa into submucosa [1–3]. The staging according to the TNM-classification was completed with the residual tumour status (R) [1, 2, 7–9]. Anatomically the rectum was defined as a 16 cm long segment between the ano-cutaneous line and the sigmoid colon.

Patient survival was measured from the time of operation. As expected survival rates of the 1990's of the Luxembourgish population were not yet available the calculation of the relative survival rates was not possible. The observed survival rates were analysed in relation to curative resection (i.e. R0-cases) and without distinction of the R-status (R0, R1, R2, Rx included).

To compare our results with the data of other geographical European regions published by the WHO in "Cancer in five continents, volume VII" [17] the rectal cancers had to be added to the cancers of the rectosigmoidal junction.

The statistical evaluations included the chi-square test with a level of significance p < 0.05 and the life-table survival analysis. The age-standardized incidence rates were calculated by the direct method, the standard error of the age-standardized rates by the Poisson approximation [18].

Results

The unequivocal histopathological diagnosis of 912 consecutive invasive rectal adenocarcinomas (RC) were provided from 203 samples obtained by biopsy only (22.3%), 32 total polypectomy specimens (3.5%) and 677 surgical resection specimens (74.2%). The latter allowed a stratification by stage according to the TNM (UICC/AJCC)-classification [1–4]. 641 of these patients with surgical treatment have had available survival follow-up data.

The 912 invasive RC concerned 517 males (56.7%) and 395 females (43.3%), the M/F-ratio being 1.3:1. The age distribution varied from 26 years to 95 years (mean: 68.9 years). The average, annual, all-ages incidence rate of rectum cancer in Luxembourg over the period 1988–1998 was 20.7 per 100,000 both gender together, for males 23.8 per 100,000 and for females 17.6 per 100,000. The average, annual, age-standardized incidence rate (ASR) of rectum cancer (period 1988–1998) was 12.1 per 100,000 (12.1 +/- 0.4 with 95% confidence interval), for males 16.5 per 100,000 (16.5 +/- 1.1,95% confidence interval) and for females 8.7 per 100,000 (8.7 +/- 0.5,95% confidence interval).

The crude and age-standardized incidence rates in relation to gender, did not significantly decrease (Figure 1). The comparison of patients diagnosed in the 5-year periods 1988–1992 and 1994–1998 revealed a slight decrease of the crude, age standardized incidence rates for both gender from 12.6 to 11.9, for females from 7.7 to 7.5 and for males from 17.1 to 15.8.

Figure 1
figure 1

Frequency of new invasive adenocarcinomas (n = 912 cases) Period 1988–1998.

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The time trend (1988–1998) of the invasive RC shows a non significant increase of the frequency (p = n.s.). The total number of invasive RC rose from 89 cases in the year 1988 to 95 cases in 1998. The number of RC in males grew from 56 to 58 and in females from 33 to 37. Comparing the two five-year periods 1988–1992 and 1994–1998 there was a slight increase in the absolute number of all RC from 409 to 425 cases. The absolute number of RC in males grew from 226 to 240 cases, in females from 183 to 185 cases.

Figure 2 shows the age distribution of all patients with a morphologically confirmed invasive rectal adenocarcinoma (n = 912). 5.6 % of the patients (51/912) had less than 50 years of age, 15.9 % between 50 and 60 years; 29.2 % between 60 and 70 years; 31.3 % between 70 and 80 years and 18 % of the patients were 80 years and above.

Figure 2
figure 2

Invasive rectal adenocarcinomas (n = 912) – age distribution – period 1988–1998.

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Time trends in relation to the tumour-stages defined by the TNM-System (UICC/AJCC) are represented in Figure 3. During the two five-year periods 1988–1992 versus 1994–1998 there is an highly significant increase of diagnosed stage 0 i.e. high-grade adenomas by 355 %. Stage I-cases decreased by 11 % and Stage IV-cases by 47 %. Stage II-cases increased by 6.6 %, Stage III by 35 %.

Figure 3
figure 3

High-grade adenomas (n = 199 cases) and rectal invasive adenocarcinomas (n = 641 cases) by stage (TNM/UICC – AJCC, 1997)3

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At the same period (1988 to 1998) 199 new cases of rectal high-grade adenomas (Stage 0) have been diagnosed (Figure 4). If we compare the average of the rectal "high-grade adenoma / invasive adenocarcinoma – ratio" of the five-year periods 1988–1992 and 1994–1998 with a ratio 1:12,4 (33/409) versus 1:2,8 (150/425) there is a highly significant improvement in the last decade (p < 0.001).

Figure 4
figure 4

Rectal high-grade adenoma / invasive adenocarcinoma-ratio: time-trend from 1988 to 1998; males and females; n = 199*/912 cases

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The overall observed survival rates of 912 patients with an invasive rectal adenocarcinoma, diagnosed by biopsy or polypectomy or surgical specimen and calculated by the actuarial method (life-table) with a 95 % confidence interval (c.i.) stratified by years are:first year 74 +/- 3 % (n = 673/912); second year 59 +/- 3 % (n = 536/912); third year 51 +/- 3 % (n = 463/912); forth year 46 +/- 3 % (n = 424/912) and after five years 43 +/- 3 % (n = 396/912).

In Table 2 the observed survival rates of 641 invasive rectal adenocarcinomas stratified by the stage independent of the residual tumour status (Rx, R0, R1 or R2). Table 3 shows the stratification of the observed 5-year survival rates in relation to the stages TNM (UICC/AJCC) considering only the 488 patients operated for cure (R0).

Table 2 Rectal adenocarcinomas: observed survival rates calculated by the actuarialmethod (95% confidence interval) by stage (TNM/UICC, 1997) [3] without distinctionof the R-status (R0, R1, R2, Rx) n = 641 cases
Full size table
Table 3 Rectal adenocarcinomas – 5-year overall observed survival rates calculated by the actuarial (life-table) method (95% confidence interval) – curative resection (R0)*
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(*The analysis of the observed survival rates concerning the 203 patients with invasive rectal cancer diagnosed by biopsy-forceps only reveals that 112 patients survived 12 months and 20 patients died in the first month, 43 within the next 6 months and 28 in the period from the 6th to the 12th month. The age distribution of these patients shows that 13 had less than 50 years, 121 were aged between 50 and 79 years and 69 patients had more than 80 years.)

Table 4 documents the world age-standardized incidence rates (ASR/W) of invasive rectal adenocarcinomas in the Luxembourgish population (females and males) in comparison to other European countries not selected at random but for geographical proximity or population-density or socio-economic reasons.

Table 4 Rectal cancer in the European Community: World age-standardized incidence rates [ASR(W)*]; 1988–1992
Full size table

To exclude an influence of changing colonoscopic diagnostic procedures in Luxembourg we analysed the data gratefully made available by the National Health Fund (NHF) [19] over the 4-year period 1992–1995. As represented in table 5, there were a non significant decrease in the number of colorectal endoscopies, a non significant increase in the number of colonoscopies with biopsy examination whereas the number of rectoscopies decreased significantly.

Table 5 Time trend of the number of colorectal 'endoscopical' procedures in Luxembourg (period 1992–1995)19
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The mortality rates by rectal cancer of the last 15 years (1984–1998) regrouped by 5-year periods are summarized in table 6[20]. In the 1980's the mortality rates for both gender decreased significantly, whereas in the 1990's they remained stable.

Table 6 Analysis of the mortality rates from all rectal adenocarcinomas of the last 15 years (1984–1998)20
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Discussion

The incidence and crude incidence rates of the invasive rectal adenocarcinomas in our series are comparable to those of the limitrophe countries [17]. Knowledge of the frequencies of rectal high-grade adenomas and of invasive adenocarcinomas over years in a defined population and area may provide essential informations and arguments for the design of a colorectal cancer prevention program [21]. Comparing two 5-year periods (1988–1992 and 1994–1998) in our series there are no significant changes over time nor of the number of newly diagnosed invasive rectal cancers (409 vs 425, p = n.s.) neither of their crude incidences (120.6/100,000 vs 117.1/100,000, p = n.s.). A similar time trend has been described by Jessup et al. [22] evaluating (National Cancer Data Base Report) a total of 98,537 rectal and rectosigmoid junction adenocarcinoma cases in the United States over the period 1985–1995.

The age distribution in our series reveals that mainly elderly patients suffer from rectal cancer, whereas only 5.5% (50/912) of the patients have less than 50 years [males 7.2% (37/516) and females 3.3% (13/396)].

The comparison of the mortality rates of rectal cancer in Luxembourg over the last 15 years (Table 6) does denote a significant decrease (p < 0.02) between the two first 5-year periods (8.7/100,000 period 1984 – 1988 and 6.6 /100,000 period 1989–1993) whereas during the two latter periods 1989 – 1993 and 1994 – 1998) there is no significant decrease (p = n.s.) [20]. It is generally accepted that stage at diagnosis is one of the strongest predictor of prognosis [23, 24]. In our series 18.1 % of the patients (116/641) were diagnosed as Stage I. This number is comparable to the results from 1005 rectal cancer cases diagnosed between 1982 and 1987 and recorded by the tumour-registries of Mallorca (Spain), Côte d'Or (France) and Geneva (Switzerland) with 16 %, 21 % and 29 % of Stage I-cases respectively [24]. Finn-Faivre et al. described in a series of 1978 patients with rectal cancer between 1978–1993 that the proportion of patients with Stage I cancer increased from 17.7 % to 30.6 % with a corresponding decrease in those with more advanced disease [25]. Unfortunately in Luxembourg the number of Stage I-cases decreased by 11 %, that of advanced stages (i.e. Stage II and Stage III) increased by 6.6 % and 35.0 % respectively over the two 5-year periods 1988–1992 and 1994–1998. Thus it seemed that too many late stage cases (Stage II and Stage III) are diagnosed and that possibly the treatment outcome of rectal cancers in Luxembourg during the last decade has not improved significantly. This situation needs further investigations.

Survival analysis in relation to the data of the different patient-groups (i.e. all patients with morphologically verified rectal cancer diagnosis versus patients with polypectomy and rectal resection or amputation stratified by stage was undertaken (Table 2+3). The poorer prognosis correlates with the advanced tumour-stages and the residual tumour-classification, as described in the literature [7–9, 22–27]. The highly significant increase in the detection of high-grade adenomas starting in 93 is due to the increased experience of the established endoscopists in Luxembourg since the late eighties. This has led to a better surveillance of patients presenting with low-grade adenomas and a better detection of high-grade adenomas. Public awareness is less relevant as public information campaigns have been carried out much later in Luxembourg. In addition, a certain number of patients might not have received additional adjuvant post-operative therapy. This is especially due for radiation therapy (in some Stage II and most Stage III patients), as this therapy was not available in Luxembourg until the late nineties and many patients were not able to travel abroad for personal or co-morbidity reasons.

As summarized in Figure 4, we notice since 1992 a highly significant increase of the diagnoses of high-grade adenomas with a continuous improvement of the rectal high-grade adenoma / invasive adenocarcinoma-ratio although there was no significant increase of the number of gastroenterologists [19] or reimbursement of endoscopical explorations cost by the National Health Fund at least during the period 1992–1995 [19, 21]. It could be admitted that this improved ratio will lead over the next decade to a falling incidence of invasive rectal cancer.

The improvement of the adenoma/adenocarcinoma-ratio over time is an index of better quality of the endoscopic explorations. This is due mainly because of two reasons: first, the arrival of a new generation of better trained endoscopists in the late eighties and secondly, a better understanding of the preventive indications for endoscopies by the practitioner as well as the general population.

Conclusion

The classic mass-screening programmes of colorectal cancers being controversially discussed, it nevertheless seems to be necessary to reinforce early detection by means of a systematic information of physicians and patients focusing on the fifty and sixty age group in view to decrease the number of advanced tumour-stage.

For the future, the actual adenoma/adenocarcinoma-ratio of 1:2,9 (average of the last 5 years) will be accepted as "golden standard" to assess the quality of an "Endoscopic National Program of Prevention of colo-rectal cancers" in collaboration with the governmental authorities.

Author's contributions

All authors (RS, JS, JW, PT, YW, CC) collaborated intensely on all aspects of the manuscript, from research design to data preparation to presentation. RS and JS wrote and all authors approved the final manuscript.

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Acknowledgments

We thank Mrs Martine Becker, Mrs Mireille Braun and Mrs Margot Poos for their helpful assistance during the preparation of this manuscript.

The study received financial support from the national Morphologic Tumour Registry (RMT a.s.b.l.). The opinions stated in this document are those of the authors and do not necessarily represent the official position of the RMT.

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Authors and Affiliations

  1. division of pathology, National Health Laboratory, Luxembourg

    René Scheiden

  2. Morphologic Tumour Registry, Luxembourg

    René Scheiden, Julien Sand & Catherine Capesius

  3. department of gastroenterology, Medical Center of Luxembourg, Luxembourg

    Joseph Weber

  4. department of gastroenterology, Clinic St. Therese, Luxembourg

    Philippe Turk

  5. division of preventive medicine, National Health Direction, Luxembourg

    Yolande Wagener

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  1. René Scheiden
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Scheiden, R., Sand, J., Weber, J. et al. Rectal cancer in Luxembourg : a national population-based data report, 1988–1998. BMC Cancer 3, 27 (2003). https://doi.org/10.1186/1471-2407-3-27

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