1 Department of Internal Medicine, Reinier de Graaf Gasthuis; 2 Department of Medical Statistics, Leiden University Medical Center, Leiden; Departments of 3 Haematology and 4 Pathology, Academic Hospital Groningen, Groningen; 5 Comprehensive Cancer Center West, Leiden; 6 Department of Haematology, Leyenburg Hospital, The Hague; 7 Department of Clinical Oncology, Leiden University Medical Center, Leiden, The Netherlands
Received 2 January 2002; accepted 14 January 2002
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Abstract |
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The influence of age on the outcome of follicular non-Hodgkins lymphoma (FL) was studied in a population-based non-Hodgkins lymphoma registry.
Patients and methods:
This study comprised 214 follicular lymphoma patients. Grade I/II was considered separately from grade III FL. The data were analyzed with respect to three age groups: <60, 6069 and 70 years.
Results:
The overall survival rate decreased in the older age groups. Grade III patients showed a statistically significant decrease in overall survival in comparison with grade I/II patients (P = 0.03). Cause-specific survival analysis showed that in the older age groups, there was an increasing influence of concomitant disease on the death rate, especially among grade III FL patients >70 years of age. The survival curve in grade III FL patients was shown to reach a plateau. The prognostic scoring system, according to the Italian Lymphoma Intergroup, fitted better to grade I/II patients, while the International Prognostic Index showed better discrimination amongst grade III patients.
Conclusions:
Separate grading for follicular lymphoma is useful. An age >70 years has a negative impact on outcome, but the contribution of concomitant disease herein is important. Different prognostic scoring systems should be applied to the different grades of FL.
Key words: cause-specific survival, elderly patients, follicular lymphoma, prognostic score
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Introduction |
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Age-related differences in the outcome of non-Hodgkins lymphomas (NHL) are well known [4, 13]. In a previous analysis on patients in a population-based NHL registry the denominator elderly was given to patients >70 and >65 years of age, for indolent and aggressive NHL, respectively [14]. To determine more precisely the fate of patients with FL, and the impact of grade in an unselected group of patients, we analyzed the data with respect to the age groups <60, 6069 and 70 years from the Comprehensive Cancer Center West (CCCW) NHL registry. In addition, we paid special attention to the relative and cause-specific survival (CSS) and to the prognostic scoring systems according to the International Prognostic Index (IPI) [15] and Italian Lymphoma Intergroup (ILI) [7].
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Patients and methods |
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Staging was based on the Ann Arbor system [18]. Among grade I/II patients the three age groups showed adequate staging for 86, 87 and 65% of patients, respectively. Among grade III patients this was true for 89, 80 and 36% of patients, respectively. Inadequate staging was due mainly to the omission of a bone marrow biopsy.
Although consensus on treatment was reached within the NHL Study Group of CCCW, the choice of treatment was the responsibility of the local physician. Until 1989, the general guidelines for FL were radiotherapy for localized lymphomas, cyclophosphamide, vincristine, prednisone (CVP) chemotherapy or chlorambucil for stage IIIIV grade I/II FL, cyclophosphamide, doxorubicin, vincristine, prednisone (CHOP) chemotherapy for stage IIIV grade III FL, followed by radiotherapy for bulky tumors or persistent lesions.
Treatment outcome was related to complete remission rate, overall survival (OS), relative survival and CSS. Overall survival was calculated from diagnosis until death (all causes, event) or last follow-up (censored; July 2000). The OS per age group was compared to the expected survival for a cohort of the general Dutch population (data obtained from Statistics Netherlands) with the same age and sex distribution. Relative survival probabilities, defined as observed survival probability divided by the expected survival probability, were calculated using Hakulinens relative survival software [19]. The causes of death were divided among NHL, toxicity of treatment, other malignancies, concomitant diseases and unknown. Cause-specific survival was determined for the four known categories and was censored by death not due to NHL or treatment-related toxicity.
As prognostic factors for survival, we considered, along with age, the number of extranodal sites, serum lactate dehydrogenase (LDH), performance status (Karnofsky index) and stage to determine the IPI [15], as well as gender and erythrocyte sedimentation rate (ESR). Because an age-adjusted ILI has not been validated, we omitted an age-adjusted analysis of the IPI. The prognostic model according to ILI identified age, gender, number of extranodal sites, B-symptoms, serum LDH and ESR as predictive factors for OS [7]. However, no cases presented with all six adverse factors and therefore three risk groups determined by five adverse factors were considered. Although information about B-symptoms was lacking in the CCCW database, the application of the ILI model, using the remaining five variables, was considered appropriate. Like ILI we defined three risk groups in both scoring systems: low (score 01), intermediate (score 2) and high (score 35) [7].
Statistical analyses were performed using chi-square tests for trends to compare percentages in cross tabulations, and the log-rank test to compare KaplanMeier survival curves. The prognostic factors were analyzed by Cox proportional hazards regression model.
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Results |
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Among patients with grade III FL, most patients <60 years of age were in the low risk group, both in the IPI and ILI risk models. Fifty-three percent of all grade III FL patients were in the IPI low risk group, 35% in the intermediate risk group and 12% in the high risk group, while for ILI, the distribution was 49, 32 and 19%, respectively. In the younger age group (<60 years of age) LDH showed significantly more often elevated values in comparison with FL grade I/II patients (P = 0.04). In addition, significantly fewer patients (07%) had extranodal localizations compared with the FL I/II group (P = 0.01; Tables 1 and 2). Finally, initial therapy with anthracyclins was given significantly less often to FL grade III patients as age increased (P = 0.006).
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The OS curves according to IPI and ILI for the low (01), intermediate (2) and high (35) risk scores are shown in Figure 2AD separately for grade I/II and grade III FL. The ILI risk score discriminated best for grade I/II (log-rank test for trend by ILI 34.1, df = 1, P <0.001; log-rank test for trend by IPI 22.07, df = 1, P <0.001), while the IPI risk score discriminated best for grade III (log-rank test by ILI 4.93, df = 1, P = 0.03; log-rank test by IPI 10.7, df = 1, P = 0.001). Table 5 shows the 5- and 10-year survival rates according to both risk models and separately for grade I/II and grade III FL.
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Discussion |
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A comparison with respect to characteristics and treatment results of follicular lymphoma, reported in different series, is given in Table 6. There is little consistency in the proportion of the characteristics among patients in the different series, which it is assumed is related to the inclusion criteria used for the different treatment protocols. What was especially apparent was the decrease in performance among grade I/II patients in the current series compared with other grade I/II series [8, 9]. Furthermore, the distribution of age groups (more elderly patients) is different between population-based series (current CCCW and Nebraska Lymphoma Study Group [20]) as opposed to institutional or referral-based series. The finding that both IPI and ILI showed the low risk category to be patients <60 years of age and the high risk category those patients >70 years of age can be explained, in part, by the fact that both scoring systems consider age >60 years as a risk factor. In our series the probability of increased LDH among grade I/II patients was especially apparent for patients >60 years of age. With respect to elevated ESR, the CCCW registry showed a statistically significant difference among the three age groups of grade I/II patients. According to ILI an elevated ESR (besides the presence of B-symptoms) forms an important prognostic factor [7], thus probably attributing (as well as increased LDH) to the inferior prognosis among elderly patients in our series.
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Different complete response (CR) rates are reported in the literature depending on the techniques and diligence used to assess residual disease [21]. The CR rate per age group in our series was roughly the same, irrespective of grade. The chance to obtain complete remission was lower among patients >70 years of age (as was shown by the NHLCP [4]), and this was statistically significant for patients with grade I/II FL. However, the value of establishing complete remission in FL I/II patients, for whom deferred treatment in cases of low tumor burden does not jeopardize the survival rate [21, 22], can be argued.
The OS rate was inferior among the older age groups, which is especially apparent from the Cox-regression analysis. The hazard ratios for age were not significantly different between grade I/II and grade III FL (P = 0.97). Among grade I/II patients, the age group <60 years showed a median survival of 103 months, which conforms to the Stanford series [21]. For the age groups 6069 and 70 years this dropped to 73 and 46 months, respectively. In their report on age-related differences in the behavior of NHL, the NHLCP showed decreased survival rate in patients >70 years of age (and <35 years of age!) with FL in all grades (29% of that cohort had grade III FL) [4]. The Nebraska group found significantly decreased survival among patients >60 years of age and with stage I/II FL (75% of these patients had grade III FL) [23]. More series confirmed age >60 years as an adverse prognostic factor [6, 9].
With respect to grade III FL, the median survival in our series appeared to be 45, 18 and 11 months for the three respective age groups. The Nebraska group found significantly decreased survival for patients >70 years of age and with stage III/IV disease only [20]. The Group dEtude des Lymphomes dAdulte (GELA) group, in their analysis of patients with grade III FL, found that age >60 years was a statistically significant adverse prognostic factor [11], but other series did not confirm this age cut-off [10, 24]. A plateau forming in the OS curves was especially apparent for grade III FL, foremost in the age group <60 years. Most series with prolonged follow-up recognize a 2030% disease-free survival among grade III FL patients, thereby simulating the course of diffuse large B-cell lymphoma [1012, 24]. However, the South West Oncology Group (SWOG) in their report on follicular lymphomas, only of stages III/IV, could not demonstrate any difference in OS for any subtype after follow-up until 25 years after treatment [25]. The inclusion of stage I/II patients in the OS curves for grade III FL can contribute to the formation of a plateau (in our series 49% of the patients with grade III FL had stage I/II disease). Data from the Nebraska group also supports this [20, 23].
We applied a special technique to correct for natural death in elderly patients by comparing the survival with time-period and age-matched Dutch inhabitants according to Hakulinens relative survival program [19], as well as a CSS analysis by censoring for death not due to NHL or treatment related toxicity. Compared with OS the CSS (and relative survival) per age group appeared greater >60 years of age among grade I/II FL and >70 years of age among grade III FL patients. A superior CSS was also demonstrated by the MD Anderson series on grade III FL, especially for stage I/II patients [24]. In that series an age-dependent analysis of CSS was not performed. Also in the Nebraska series the difference in survival between patients <60 and >60 years of age with stage I/II FL (75% grade III) was no longer evident when looking at CSS data [23]; this has also been demonstrated for other types of aggressive NHL [26]. However, for grade I/II FL patients a CSS analysis was not different from OS in another MD Anderson series [8]. In that series age (>60 versus <60 years of age) was not significantly correlated with CSS.
The prognostic scoring system of the IPI seems less optimal for follicular lymphoma [27], because of the low number of patients in the higher risks groups [10, 12, 24]. The large series of ILI identified age, gender, B-symptoms, number of extranodal sites, serum LDH and elevated ESR as key features for prognosis of FL (irrespective of grade) [7]. In our population-based series, which lacked information on B-symptoms, we identified elevated LDH, Karnofsky performance status £70 and age >70 years as the main prognostic factors for grade I/II FL patients, whereas elevated LDH and stage III/IV disease were the main prognostic determinants among grade III FL patients. Of course, the low number of patients (especially with respect to grade III FL) contributes to the fact that statistical significance was not reached for the other prognostic factors. By comparing the OS curves according to IPI and ILI, we were able to confirm that the ILI scoring system resulted in a better prognostic differentiation for patients with grade I/II FL than the IPI system. The latter was better at discriminating between patients with grade III FL, thus supporting the concept that grade III FL should be treated as a separate entity to grades I and II, with its properties of aggressive NHLs.
Several conclusions can be drawn from the analysis of this population-based cohort of patients with follicular non-Hodgkins lymphoma. First, the achievement of complete remission was not different for grade I/II versus grade III, both showing decreased CR rate >70 years of age. Secondly, older age groups showed a decrease in the OS, whether grade I/II or grade III (Cox model). Thirdly, the median survival was lower for patients with grade III FL, irrespective of age group. However, the plateau observed in the survival curve, shown foremost by the CSS analysis, confirms the separate status of grade III FL being more akin to diffuse large B-cell lymphoma. Fourthly, the prognostic scoring system according to ILI fitted better to grade I/II FL patients, while the IPI system appeared more appropriate among grade III FL patients.
The patients in this population-based cohort have been treated according to classical guidelines of the 1980s. The new treatment options of the 1990s will hopefully lead to a long-sought after survival advantage for FL [27]. A thorough understanding of pre-existing risk factors and age-related differences should be helpful in the design of new studies and the interpretation of treatment data.
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Appendix |
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Footnotes |
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References |
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