- Citado por SciELO
versión impresa ISSN 1516-8484versión On-line ISSN 1806-0870
Rev. Bras. Hematol. Hemoter. v.30 supl.2 São Paulo jun. 2008
Avaliação de risco em mioloma múltiplo: resultados preliminares do grupo brasileiro de estudos de mieloma
Angelo Maiolino*; Vania HungriaI; Gislaine D. OliveiraII; Eliana C. M. MirandaII; Roberto MagalhãesIII; Daniel MercanteIII; Eduardo M. RegoIV; Luciana OliveiraIV; Carlos S. ChiattoneI; Marcio NucciIII; Irene Lorand-MetzeII; Ilana ZalcbergV; Cármino A. de SouzaII
ISanta Casa da Misericórdia de São Paulo - São Paulo-SP
IIUniversidade Estadual de Campinas (Unicamp) - Campinas-SP
IIIUniversidade Federal do Rio de Janeiro (UFRJ) - Rio de Janeiro-RJ
IVUniversidade de São Paulo (USP) - Ribeirão Preto-SP
VInstituto Nacional de Câncer (Inca) - Rio de Janeiro-RJ
The Durie/Salmon staging system continues to be used worldwide in patients with multiple myeloma. However, in recent years, new systems have been proposed. The International Myeloma Working Group performed a retrospective study with 11,179 patients and proposed an "International Staging System" utilizing serum levels of â2 microglobulin and albumin. In addition, current research has focused on the usefulness of cytogenetic and molecular data as prognostic factors. These data suggest that these parameters are powerful discriminators of a poor prognostic group of myeloma patients. Indeed, these prognostic indexes have been utilized in clinical trials, with interesting and encouraging results.
Key words: Prognostic factors; multiple myeloma; molecular biology; treatment.
O esquema de Durie / Salmon continua a ser utilizado para estadiar os pacientes com mieloma múltiplo. Recentemente, um novo sistema mais simples e eficaz foi proposto. O "International Myeloma Working Group" realizou um estudo retrospectivo com 11.179 pacientes e a partir destes dados propôs a criação de um "International Staging System (ISS)" utilizando os níveis séricos de ß2 microglobulina e de albumina ao diagnóstico. Além do ISS a pesquisa está voltada para identificar alterações citogenéticas e moleculares que se correlacionem com o prognóstico no mieloma múltiplo. Estes fatores prognósticos têm sido utilizados para estratificar pacientes em ensaios clínicos com resultados promissores.
Palavras-chave: Fatores prognósticos; mieloma múltiplo; biologia molecular; tratamento.
Multiple myeloma (MM) is a malignant clonal plasma cell disorder accounting for 1% of all cancers and 10% of hematological malignancies.1 The main characteristic of the disease is the clonal proliferation of plasma cells, and the production, in the majority of cases, of a monoclonal heavy and/or light chain immunoglobulin (M-protein).2 This disease occurs in older population, with median age at presentation of 65 years.3 Fewer than 2% of MM patients are under 40 years old at diagnosis.4 The survival of MM patients varies from a few months to more then ten years, depending on characteristics related to the disease itself (plasma cells abnormalities, tumor mass, stromal factors), as well as to host factors.5;6 These risk factors for the development and progression of disease have been considered to be critical in the comparison of outcomes within and between different clinical trials. This strategy of assessing the patient according to the presence of risk factors is important on an individual basis, because it can predict the outcome. In addition, it adequately stratifies the patients in clinical studies.7-10
Clinical, biological and molecular factors adversely influence the outcome, and prognostic models have been developed trying to stratify patient into groups of different survivals.5;7;10-12
The prognostic assessment has been based on risk factors, and can be divided in:
- Clinical factors:
1. age distribution: poorer survival in older patients;
2. performance status
- Factors related to the biology of the malignant clone:
1. cytogenetic and molecular abnormalities
2. proliferation index (high proliferative activity)
- Tumor mass and organ damages:
1. renal failure (creatinine)
2. high serum levels of β2-microglobulin and C-reactive protein
Since the development of the Durie/Salmon staging system 3 decades ago, new prognostic models that include these three groups of characteristics have been proposed.12 The Durie/Salmon staging system takes into account clinical and laboratorial parameters, trying to estimate the tumor mass, and consequently the prognosis. Analyzing the presence of four factors at diagnosis (anemia, M protein, calcium and lytic bone lesions) and presence of high serum creatinine levels, this system divided MM patients in three defined groups, with three different survival curves.
Looking for other prognostic markers, the level of β2 microglobulin showed to be an interesting prognostic factor because it correlates with tumor mass and renal dysfunction. The cutoff of 6 mg/L of ß2 microglobulin was able to divide MM patients in two groups of different prognoses.13 In 2003, the International Myeloma Study Group suggested another staging system that incorporates the beta-2-microglobulin. This system is easier than the Durie/ Salmon, and still predicts the outcome.10 This staging system, called "International Staging System" (ISS), was based on only two variables (β2-microglobulin and albumin), and was able to define three prognostic groups with different median survivals.
The comparison between these two staging systems showed that the ISS is better to define patients in stage I and II than Durie/ Salmon, and that patients in stage III of the ISS have worse prognosis than stage III of Durie/Salmon.10
The ISS has been validated on different settings of patients and treatments of MM, including a recent analysis among 1.112 Brazilians patients diagnosed during the past seven years.14
The C-reative protein is another marker of tumor mass that has been used as prognostic factor. It has a good correlation with tumor growth, and it is independent of the β2 microglobulin levels. Another index score that incorporates this marker is under study.15
Other factors that correlate with the outcome include plasma cell morphology, type of bone marrow infiltration, expression of adhesion molecules (CD56), high proliferative activity, and angiogenesis.16-20
Recently, various cytogenetic abnormalities present in the myeloma clonal cells were studied, and were strong prognostic factors. By conventional cytogenetic analysis, at least 39% of MM patients exhibit cariotypic abnormalities.21 With the use of tests with greater sensitivity, such as FISH analysis, several abnormalities have been described, in a greater proportion of patients.22 Deletions/monosomy of chromosome 13, non-hyperdiploidy, and certain balanced translocations (including chromosome 14) are predictors of poor outcome.23-25 The deletion or monosomy of chromosome 13 represents the most prevalent abnormality, accounting for 50% of the abnormalities observed. This abnormality occurs in 45% of patients with MM analyzed by molecular technique (FISH analysis).24;26;27 and its presence is independently associated with poorer survivals and duration of complete remission.21
With the addition of all these new molecular profiles to clinical variables, new staging systems may be even more powerful to identify prognostic groups.
Data presented recently by the Intergroupe Francophone du Myelome (IFM) showed a high incidence of cytogenetic abnormalities, in agreements with other studies, but they were able to identify three groups of patients with different median overall survivals, according to b2 microglobulin levels and the presence of t(4;14) or del(17p). The best overall survival was observed among patients with β2 microglobulin levels <3 mg/L and absence of t(4;14) or del(17p). This profile was observed in 35% of patients. Patients with the worst overall survival (median 2 years) comprised 15% of patients, and included β2 microglobulin >3mg/L and the presence of either t(4;14) or del (17q). The other 50% of patients belonged to an intermediate group.26
The rational of staging a patient is to quickly identify high risk patients, and target the most appropriated therapy for each case. Unfortunately, this is not yet standard of care, but it is a matter of several clinical trials worldwide.7;25;27-30 A recent study of the IFM based the treatment of MM on the staging of the patients. It suggested dividing patients in two groups, according to β2-microglobulin levels and the presence of chromosome 13 deletion. High risk patients were those with β2 >3 mg/L and the presence of del 13 by FISH analysis.
Patients without these high risk criteria were treated with two consecutive stem cell transplants conditioned with melphalan 140 mg/m2 and 200 mg/m2 (IFM 99-02). Patients classified as high risk were enrolled in treatment strategies that included higher doses of chemotherapy (200 and 220 mg/m2 of melphalan), followed by two autologous stem cell transplants (IFM 99-04) or one autologous and one HLA-identical sibling dose-reduced allogeneic transplant (IFM 99-03). The IFM 99-04 showed that in high-risk patients, the dose intensity of melphalan at 420 mg/m2 led to encouraging results, but the addition of anti-IL6 monoclonal antibody to the second conditioning regimen did not improve the outcome.25 The IFM 99-02 showed that maintenance with thalidomide after the autologous transplant resulted in an improvement in the response rate, event free survival and overall survival in patients without deletion of chromosome 13 and / or in those with a beta-2 microglobulin < 3,0 mg/L.28
Treatment based on risk assessment has been also proposed in a prospective studied by Brazilians researchers. The treatment protocol includes a stratification based on the presence of deletion of chromosome 13 and b2 microglobulin >2.5 mg/L (high risk). For patients without high risk criteria, an induction remission with chemotherapy (VAD) is followed by a single autologous peripheral blood transplant using melphalan 200 mg/m2. Patients are then randomized to receive maintenance treatment with dexamethasone with or without thalidomide 200 mg/day. For high risk patients, the protocol consists of a first autologous transplant with melphalan 200 mg/m2, followed by a second transplant with the same conditioning regimen, or a dose-reduced allogeneic transplant if the patient has a matched donor. After the second transplant, patients are randomized to receive maintenance treatment with chemotherapy (DCEP) + / - thalidomide. From October 2003 to January 2008, 229 untreated patients under 70 years old were enrolled. The median observation time for whole group was 22 months and for alive patients 24 mo (1-62). 44 out 179 (24%) died, most of them in VAD phase due to progression. 135/179 (76%) are alive, ISS I 45/53 (85%), ISS II 57/68 (84%) and ISS III 33/58 (57%) (p< 0.001). The OS in 60 mo by ISS was 76%, 75% and 36% for ISS I, II and III, respectively (p< 0.0001). The EFS in 60 mo by ISS was 38%, 32% and 10% for ISS I, II and III, respectively (p< 0.0001). The ANOVA showed significant difference for plasma cells bone marrow infiltration, creatinine and hemoglobin levels (p< 0.0001). The authors emphasized the importance of ISS at diagnosis due to high capacity to discriminate among groups with low cost. The protocol is still ongoing.
Conclusions and recommendations
Staging patients according to prognostic factors has been the subject of several researches and has been used to guide clinical trial protocols. In the future, this approach is hoped to help in defining treatment regimens on a patient basis, with a favorable impact on the prognosis.
The recommendation of recent guidelines on the management of MM (4) includes:
1. The International Prognostic Index based on serum albumin and β2 microglobulin in preference of Durie/Salmon staging system.
2. Evaluate prognosis before starting treatment with, as a minimum, serum levels of β2 microglobulin and albumin. Cytogenetic and/or FISH analysis may be helpful if available.
3. At present there is no evidence to support using prognostic factors to choose therapy in individual patients.
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Department of Internal Medicine
Universidade Federal do Rio de Janeiro - UFRJ
Hospital Universitário Clementino Fraga Filho
Av. Brigadeiro Trompovsky, s/no, 4º andar, sala 4A12 - Ilha do Fundão
21941-590 - Rio de Janeiro-RJ - Brazil
O tema apresentado constou do programa do Encontro AIBE.
Avaliadores: Professores Ângelo Maiolino, Cármino Antonio de Souza e Marcio Nucci.
Publicado após concordância do editor.
Conflito de interesse: não declarado.
* Associate Professor of Medicine. Universidade Federal do Rio de Janeiro (UFRJ) - Rio de Janeiro-RJ.