Abstract
We analyzed morphological and immunohistochemical features in 174 aggressive B-cell lymphomas of nodal and extranodal origin. Morphological features included presence or absence of a follicular component and cytologic criteria according to the Kiel classification, whereas immunohistochemical studies included expression of CD10, BCL-2, BCL-6, IRF4/MUM1, HLA-DR, p53, Ki-67 and the assessment of plasmacytoid differentiation. Patients were treated with a CHOP-like regimen. While the presence or absence of either CD10, BCL-6 and IRF4/MUM1 reactivity or plasmacytoid differentiation did not identify particular cytomorphologic or site-specific subtypes, we found that expression of CD10 and BCL-6, and a low reactivity for IRF4/MUM1 were favourable prognostic indicators. In contrast, BCL-2 expression and presence of a monotypic cytoplasmic immunoglobulin expression was associated with an unfavourable prognosis in univariate analyses. Meta-analysis of these data resulted in the development of a cumulative immunohistochemical outcome predictor score (CIOPS) enabling the recognition of four distinct prognostic groups. Multivariate analysis proved this score to be independent of the international prognostic index. Such a cumulative immunohistochemical scoring approach might provide a valuable alternative in the recognition of defined risk types of aggressive B-cell lymphomas.
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Introduction
Diffuse large B-cell lymphomas (DLBCL) comprise a heterogeneous category of malignant Non-Hodgkin lymphomas (NHL) with respect to morphology, immunophenotype, genetic features, and clinical course [1]. The striking differences regarding outcome, especially, have prompted the assumption that this lymphoma type includes different disease entities and that their delineation might allow the assignment of tailored treatment approaches to defined risk profiles. These attempts, in the past, aimed at the assessment of morphological criteria, such as the separation of immunoblastic and centroblastic types [2], the evaluation of genetic aberrations [3] and certain biological features, such as the proliferation index [4–6], or the expression of relevant proteins like BCL-2 [7–11].
Gene expression profiling using cDNA and oligonucleotide microarrays proved to be a powerful tool both in the delineation of two main differentiation phenotypes in DLBCL, namely a germinal center (GC) B-cell like and an activated B-cell like (ABC) DLBCL type, as well as in the recognition of prognostically relevant gene expression profiles [12–14]. The striking clinical impact of distinguishing GC- and non-GC types of DLBCL, demonstrated in the CHOP-, but more recently also in the R-CHOP treatment era [15], led to the search of individual genes or smaller numbers of genes the expression of which might facilitate their recognition in order to make this approach amenable to routine diagnostic practice [16–19]. This approach also includes the widely used Hans-algorithm [17]. However, a number of studies provided highly variable and conflicting data questioning their suitability to define robust clinical risk groups [16, 17, 20–29]. By investigating well known markers which correlate with a germinal center or post-germinal center differentiation (CD10, BCL-6, IRF4/MUM1) as well as other markers of potential prognostic importance [17, 30, 31] we constructed, as a new approach, a cumulative immunohistochemical outcome predictor score resulting in the delineation of four distinct prognostic groups.
Material and methods
Specimen selection
Inclusion of samples required the availability of diagnostic material (paraffin blocks) and that the patient had not been treated before biopsy. Therefore, samples from patients with known preceding low-grade lymphoma were excluded. Material from 166 DLBCL patients fulfilled these criteria. Of these, 10 DLBCL had an additional follicular lymphoma grade 3B (DLBCL + FL3B) component, and 13 tumors harbored an additional FL3A area. Because of their striking morphological, immunophenotypic and genetic similarities with diffuse large B cell lymphomas [32], we also included 8 purely follicular lymphomas grade 3B (FL3B). Thus, altogether, specimens from 174 patients with aggressive large B-cell tumors diagnosed between 1990 and 2003 were enrolled in this study. Clinical data were available from referring clinicians in all patients (Table 1). All patients, with a single exception, were treated with a CHOP or CHOP-like chemotherapy regimen. The study was approved by the Local Ethics Committee of the University of Würzburg, Germany.
Nodal and extranodal origin of tumors
The large majority of lymphomas arose in the lymph nodes, while other lymphatic organs primarily infiltrated were the spleen in six cases and the pharyngeal tonsil in another six cases. 28 tumors presented with primary extranodal origin, the majority of them (n = 17) in the stomach but also in the thyroid gland (6 cases), the small and large intestine (3 cases), the breast and sinus maxillaries (1 case each).
Morphology
All cases were reviewed on whole tissue sections stained for Hematoxylin and Eosin, Giemsa, Periodic acid-Schiff (PAS) and Gomori’s silver impregnation. Diagnoses were made according to the criteria of the WHO classification of 2008 and, in addition, variants were described according to the criteria of the Kiel classification in diagnosing centroblastic-monomorphic, centroblastic-multilobated and centroblastic-polymorphic lymphomas [33]. In DLBCL with an additional FL3 component, the presence of follicular dendritic cell networks was confirmed by immunostaining using appropriate antibodies (CD21, CD23), and follicular structures had to be present in at least 25% of the infiltrated areas.
Immunohistochemistry
For diagnostic purposes, immunostaining was performed on paraffin sections using B-cell markers CD20 (Clone L26, DAKO, Glostrup, Denmark, 1:1000) and CD23 (Clone 1B12, NOVOCASTRA, Newcastle upon Tyne, United Kingdom, 1:80) and T-cell markers CD3 (NOVOCASTRA, 1:80) and CD5 (Clone 4C7, NOVOCASTRA, 1:40). Proliferation indices (PI) were estimated in areas with the highest reactivity and recorded in increments of 10% after staining with the MIB1 antibody (MM1, NOVOCASTRA, 1:30) detecting the Ki67 antigen. The expression of CD10 was assessed using the antibody NCL-CD10 270 (NOVOCASTRA, 1:100). BCL-6 was detected using the PG-B6p antibody (DAKO, 1:20) and IRF4/MUM1 staining involved the MUM1p antibody (DAKO, 1:8000), also evaluated in increments of 10%. HLA-DR expression was analyzed using clone IQU9 (NOVOCASTRA, 1:80).
The expression of p53 was investigated on paraffin sections using the DO-7 antibody (DAKO, 1:40). To score a case as positive, strong nuclear expression in at least 20% of cells was required. To assess plasmacytoid differentiation (CIg+), intracytoplasmic immunoglobulin was detected with antibodies to kappa and lambda light chains and in some cases to IgM (all DAKO, 1:20000). An unequivocal monotypic cytoplasmic reactivity was required to score a case as CIg+. BCL-2 expression was evaluated on paraffin sections using the antibody from DAKO (Clone 124, 1:400). A reactivity of >20% of cells was regarded as positive. The presence of follicular dendritic cell (FDC) meshworks was ascertained either by staining for CD23 (Clone 1B12, NOVOCASTRA, 1:80) or by using an antibody to CD21 (Clone 1F8, DAKO, 1:200). All immunohistochemical reactions on paraffin were performed using the peroxidase anti-peroxidase (PAP) method after antigen retrieval [34]. The quantitative assessment of immunohistochemical staining evaluation was performed according to the scoring guidelines recommended by de Jong and co-workers [35].
Statistical analyses
Frequencies in different parameters were compared and analysed using the chi-square test, t-test for independent variables, or other appropriate tests, respectively, depending on the nature of data. Overall survival (OS) was measured from the date of diagnosis to death from any cause or to last follow-up. OS distributions were calculated according to the methods described by Kaplan and Meier. Time to event distributions were compared using the log-rank test. A multivariate analysis including the risk factors of the international prognostic index (IPI) was carried out to determine independent predictors of survival by using the Cox proportional hazard model for survival analysis and Pearson’s correlation. A p value of <0.05 was regarded as statistically significant.
Results
Clinical data
Clinical data were available for all patients listed in Table 1. Age distribution showed a peak in the 7th decade with a slight male predominance. The patients presented with advanced disease (Ann Arbor stages III and IV) in more than half of the cases. The median follow up time was 33 months ranging from 1 month to 163 months.
Primary localization of lymphomas and morphology
132 lymphomas arose in lymph nodes, while in 12 additional cases the largest and/or only tumor mass was found in the tonsil or spleen, respectively (6 cases each). Two tumors involved the bone marrow exclusively, with leukemic spread. 28 DLBCL presented with a primary extranodal localization. The stomach was the most frequent extranodal site involved (17 cases), while the other sites were the thyroid gland (n = 6), the small and large intestine (n = 3), the breast, and the maxillary sinus (n = 1 each). 143 tumors were pure DLBCL, while 23 cases had a detectable follicular component. Ten cases were classified as DLBCL with a FL3B component, and 13 DLBCL showed an additional FL3A component (most of them with a multilobated cytology). Eight lymphomas were purely follicular FL3B. All extranodal tumors were classified as DLBCL.
All lymphomas with a predominantly diffuse component (i.e. DLBCL ± minor FL component) involving lymph nodes, spleen or tonsils were subclassified according to the Kiel classification as centroblastic-monomorphic and/or centroblastic-multilobated (63 cases), centroblastic-polymorphic (28 cases) and immunoblastic (24 cases) lymphomas.
Immunophenotypes
Due to loss of material, complete immunophenotypes were available in 145 cases. CD10 was expressed in 57/145 evaluable cases (39%). In contrast to this antigen, that was usually either homogeneously present or absent on all tumor cells, both BCL-6 and IRF4/MUM1 reactivities varied considerably ranging from 0% to 100% of cells in a given tumor. A high expression of BCL-6 in ≥70% of nuclei, like in the reactive germinal center (GC) was encountered in 73 (50%) lymphomas, while 43 tumors (30%) showed an intermediate reactivity (20%–60%). No or low levels of BCL-6 expression (<20%) were seen in 27 tumors. IRF4/MUM1 was positive in ≥50% of nuclei in 45 cases (31%). BCL-2 was expressed in 100 lymphomas (69%). The Ki-67 antigen was expressed in ≥80% of nuclei in 82 tumors (57%). A monotypic cytoplasmic immunoglobulin expression could be detected in 62 of 145 (43%) cases. P53 was overexpressed (≥20% positive tumour cells) in 29 of 143 (20%) DLBCL. HLA-DR expression was present in 121 of 124 cases (98%). Only 3 cases showed no expression (<10% of cells).
Heterogeneity of immunophenotypes
In contrast with the rather ordered immunophenotypic profile encountered in the various compartments of reactive lymphoid tissues, the expression of immunophenotypic markers was highly heterogeneous in the lymphoma cases. For example, BCL-2 was expressed in 37/57 (65%) CD10 positive tumors, in comparison with 63/88 (72%) CD10 negative cases; seven CD10-positive tumors (12%) also expressed the post-germinal marker IRF4/MUM1 in at least 50% of cells.
Overall, there was a strong positive correlation between the expression of CD10 and BCL-6, while CD10 positivity was negatively correlated with MUM1 reactivity. In highly proliferative tumours (Ki-67 index ≥ 80%), there were more lymphomas with BCL-6 expression (44/54) and CD10 expression (34/54). In contrast, tumors with proliferation indices <80% harbored fewer cases with a GC phenotype, but were more often IRF4/MUM1 and BCL-2 positive.
There was a wide distribution of the different morphologic subtypes within the GC-related and non-GC-related lymphomas according to the Hans classifier [17]. 37/44 (84%) multilobated centroblastic lymphomas (CB) were GCB DLBCL, as were all multilobated centroblastic DLBCL with a FL3A component. Only 16/27 (59%) of the centroblastic polymorphic DLBCL were of GCB type. In contrast, 18/21 (86%) immunoblastic lymphomas (IB) were non-GCB related. It is interesting to note that among tumors other than multilobated centroblastic cases, purely follicular FL3B tumors were more often of GCB type (6 GCB, 2 non-GCB), while DLBCL with a FL3B component predominantly fell into the non-GCB group (3 GCB, 7 non-GCB). Primarily extranodal lymphomas were GCB (n = 13) and non-GCB (n = 14) types in equal distribution.
Correlations with survival
Within 145 lymphomas with a complete immunophenotype, 121 tumors with nodal, splenic or tonsillar involvement and 24 primarily extranodal DLBCL had follow-up data available. Adverse clinical variables with regard to overall survival (OS) were elevated LDH levels (p < 0.001), presence of B symptoms (p = 0.002), and age >60 years (p = 0.04). The IPI also was a powerful outcome predictor (p < 0.001).
Neither the presence of a (partly) follicular growth pattern (p = 0.9), nor the primary site of involvement (nodal/extranodal) predicted survival (p = 0.7).
In univariate analysis, the following immunohistochemical parameters predicted an unfavourable prognosis: BCL-2 expression irrespective of staining intensity (p < 0.001), CD10 negativity (p < 0.02), BCL-6 expression in <20% of cells (p < 0.001), IRF4/MUM1 reactivity in ≥50% of nuclei (p < 0.02), and monotypic cytoplasmic immunoglobulin expression (CIg+) (p < 0.03). In addition, in the present series, stratification of the tumors into GC-related and non-GC-related types according to the criteria described by Hans et al. [17] was predictive of survival and showed a GC differentiation to represent a favourable parameter (p < 0.01; Fig. 1). Univariate analyses of HLA-DR and p53 expression and the proliferation index failed to yield statistically significant correlations with survival.
Development of a cumulative immunohistochemical outcome predictor score (CIOPS)
To test whether the patients could be more accurately categorized into favourable and poor-risk groups we devised a cumulative scoring system based on the sequential addition of negative prognostic indicators in a given tumor (cumulative immunohistochemical outcome predictor score: CIOPS). Each variable that emerged as prognostically negative in univariate analysis (CD10 negativity, BCL-6 expression in <20%, BCL-2 positivity, MUM1/IRF4 expression in ≥50%, cytoplasmic immunoglobulin expression) was scored as one negative factor, and the sum of negative factors resulted in a risk score that ranged from zero to five in each given case.
When the prognostic effect of the score was analyzed in the 145 patients using the Kaplan-Meier model, a dramatic difference in survival was recognized between cases without risk factors (score: zero), cases with 1–2 adverse prognostic factors, cases with 3–4 adverse prognostic factors, and cases with a score of five (p < 0.0001; Fig. 2).
In the favourable prognostic group with 14 patients, all patients except for one survived. Review of the medical report indicated that this patient was an 80-year old woman who, after diagnosis, refused further treatment. In contrast, in the group with a CIOPS score of five 7 of 8 patients died (the surviving patient was a 65 year old male with an initial Ann Arbor stage 2 and an IPI of 2, follow up time 83 months). The survival curves of the remaining 123 patients with intermediate scores (1–4) were also different with the possibility to distinguish a favorable intermediate (scores 1–2) and a poor intermediate group (scores 3–4) that show significant differences in survival (p = 0.0398). In multivariate analysis, the cumulative immunohistochemical outcome predictor score proved to be independent of the IPI index, including age, stage of disease, elevated serum LDH, B-symptoms and extranodal manifestation.
Table 2 gives an overview of the distribution of the immunophenotypes in the different CIOPS subgroups. As can be seen from this table, the immunohistochemical features dividing the tumors into CIOPS groups 2 and 3 were variable. Using the algorithm of Hans et al. [17] CIOPS group 2 contained 61 GCB and 12 non-GCB cases, and group 3 contained 40 non-GCB and 10 GCB cases. The two most important features that discriminated between the groups 1 and 2 were more frequent BCL-2 positivity or CD10 negativity in group 2. Monotypic cytoplasmic immunoglobulin expression or IRF4/MUM1 expression was a classifying feature in group 3.
No morphological subtypes clustered within a distinct CIOPS group. Those immunoblastic lymphomas, for whom immunohistochemistry was available (n = 10), were more or less equally distributed among different CIOPS groups (CIOPS 2: 2 cases; CIOPS 3: 3 cases; CIOPS 4: 2 cases; CIOPS 5: 1 case), although none were found in low CIOPS group.
Discussion
Diffuse large B-cell lymphomas comprise a heterogeneous group of lymphoid tumors with varying morphology, immunophenotypes, genetic characteristics, and clinical course. Previous studies have aimed at the more accurate definition of their risk profiles using different criteria such as morphology [2, 36, 37], protein expression patterns targeting several proliferation or apoptosis related antigens [4, 5, 7–11, 38, 39] or their genetic constitution [3, 40, 41].
Because of the conflicting data resulting from earlier studies on the value of immunohistochemical marker expression in DLBCL [17, 20, 22, 25, 42, 43], we applied a novel, slightly different approach and constructed a cumulative immunohistochemical outcome predictor score (CIOPS) to divide DLBCL patients into various risk groups. Following the notion that—in contrast to normal B-cell differentiation - dual expression of both GC-related and GC-unrelated markers [e.g. BCL-6 and IRF4/MUM1 [44]] can be frequently observed in the same tumor, the immunohistochemical assignment to the GCB- or non-GCB group appears problematic.
In the present study, the combined analysis of antigens having been related to either a germinal center differentiation of normal reactive and tumor cells, such as CD10 and BCL-6, or pointing to a postfollicular differentiation step (IRF4/MUM1, plasmacytoid differentiation) has clearly confirmed the heterogeneity of antigen expression patterns in DLBCL as compared with compartments of the reactive lymphoid tissues [44–47]. Nevertheless, statistical analysis revealed a strong positive correlation of CD10 and BCL-6 expression on one hand, and of IRF4/MUM1 expression and plasmacytoid differentiation on the other hand. Moreover, in univariate analysis, expression of both CD10 and BCL-6 identified prognostically relevant favourable subgroups, while IRF4/MUM1 reactivity in 50% or more of tumor cells characterized tumors with an inferior prognosis. In our study, two additional features were of value for identifying risk groups, namely the expression of BCL-2 and the assessment of plasmacytoid differentiation of the tumor cells. While the negative prognostic impact of BCL-2 expression in DLBCL is well established [7–11], few studies have addressed the possible importance of plasmacytoid differentiation in DLBCL. Simonitsch-Klupp and colleagues [48] demonstrated that plasmablastic/plasmacytoid differentiation represents a significant risk factor in DLBCL. Immunoblastic morphology, which frequently goes along with plasmacytoid differentiation, has been repeatedly identified as a risk factor in DLBCL [2, 37]. The prognostic importance of plasmacytoid differentiation using the analysis of kappa and lambda light chain expression in the cytoplasm of the tumor cells, however, has not been evaluated so far.
Given the promiscuous expression of GC- and non-GC related proteins in a subset of DLBCL which makes the strict categorization into GCB and non-GCB DLBCL groups difficult at the immunohistochemical level, we investigated the possible clinical impact of a model that sequentially adds risk markers rather than basing risk assessments on decision trees. Specifically, by assigning equal weights to each of the immunophenotypic features identified in univariate analysis, we developed a cumulative immunohistochemical outcome predictor score (CIOPS). To each case, an individual risk score from zero to five is attributed which is based on prognostically negative factors including the absence of CD10 expression, BCL-6 reactivity in <20% of cells, IRF4/MUM1 positivity in ≥50% of nuclei, BCL-2 expression, and plasmacytoid differentiation of the tumor cells. Plotting the survival of the different patient cohorts according to the CIOPS group revealed four highly distinct survival curves with a low-risk group consisting of patients characterized by a score of zero, patients with a high-risk score of 5 with a dismal course and two intermediate groups with CIOPS scores 1 and 2 and 3 and 4, respectively. Multivariate analysis comparing the CIOPS score to the IPI stressed its independent prognostic value in clinical risk assessment. Besides the delineation of four distinct prognostic subgroups, the CIOPS score also identifies two patient cohorts at the extremes of the spectrum with striking differences in the mortality rates (7% vs. 100%) which might be a valuable feature towards future risk adapted therapeutic strategies. Clearly, any prognostic significance of the CIOPS score has to be studied in the context of an independent study cohort with an increased number of patients suffering from DLBCL.
One major caveat to the interpretation of these data is that the investigated patient cohort stems from the pre-Rituximab era. However, a recent major gene expression profiling study suggests that many molecular features with prognostic significance in the CHOP treatment era are retained in the CHOP-R treatment era [15]. Therefore, studies that are already under way will have to determine whether our cumulative immunohistochemical model might also be of predictive value in patient cohorts treated with current protocols.
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Acknowledgements
The expert technical assistance of H. Brückner, S. Roth, P. Stempfle, S. Groh, C. Rudolph, and K. Schroedl is gratefully acknowledged. We also thank E. Schmitt for artful photographic work. We are indebted to our clinical colleagues for providing clinical data, especially to R. Kuse and R. Sonnen, Hamburg, and to M. Wilhelm, Nürnberg and U. Gunzer, Würzburg.
AR is supported by the Interdisciplinary Center for Clinical Research (IZKF), University of Würzburg. GO and HH are supported by the Robert-Bosch-Stiftung.
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Andreas Rosenwald and German Ott are joint senior authors.
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Höller, S., Horn, H., Lohr, A. et al. A cytomorphological and immunohistochemical profile of aggressive B-cell lymphoma: high clinical impact of a cumulative immunohistochemical outcome predictor score. J Hematopathol 2, 187–194 (2009). https://doi.org/10.1007/s12308-009-0044-x
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DOI: https://doi.org/10.1007/s12308-009-0044-x