Tumour Review
Primary and secondary bone lymphomas

https://doi.org/10.1016/j.ctrv.2015.02.001Get rights and content

Highlights

  • Three clinical forms of bone lymphoma exist: the primary, the polyostotic and the secondary bone lymphoma.

  • Level of evidence supporting therapeutic decisions in these rare tumors is low, and prospective trials appear unrealistic.

  • This review is based on the analysis of the largest available database of bone lymphomas and of relevant literature.

  • We provide recommendations for diagnosis, staging and treatment of patients with bone lymphoma in everyday practice.

  • Special conditions like pathological fractures, indolent lymphomas and central nervous system prophylaxis are also discussed.

Abstract

Recent studies have contributed to the enhancement of clinical and molecular knowledge on bone lymphomas, a group of rare malignancies with particular characteristics. Nevertheless, several questions remain unanswered and the level of evidence supporting some diagnostic and therapeutic decisions remains low. Currently, three different forms of bone lymphomas can be distinguished: the primary bone lymphoma, consisting of a single bone lesion with or without regional lymphadenopathies; the polyostotic lymphoma, consisting of multifocal disease exclusively involving the skeleton; and the disseminated lymphoma with secondary infiltration of the skeleton. The first two forms exhibit a good prognosis, requiring treatments similar to those commonly used for nodal lymphomas of the same category, but several issues regarding the role of surgery and local control of the disease, the sequence of treatment, radiation volumes and doses, management of pathological fractures and prevention of late sequelae deserve particular attention. Due to its rarity, prospective trials exclusively focused on bone lymphomas appear unrealistic, thus, critical revision of our own experience and analyses of large cumulative series as well as molecular studies on archival cases remain valid alternatives to improve our knowledge on this obscure lymphoproliferative malignancy.

The present review is based on the analysis of the largest available database of bone lymphomas established under the sponsorship of the International Extranodal Lymphoma Study Group (IELSG) as well as on the critical revision of related literature. We provide recommendations for diagnosis, staging, treatment, and response assessment of these patients in everyday practice as well as for the management of special conditions like pathological fractures, indolent forms and central nervous system prophylaxis.

Introduction

Every lymphoma category can involve the skeleton, as an exclusive lesion or as a part of a disseminated disease. Although skeletal involvement is relatively common in non-Hodgkin lymphomas, the available literature on diagnostic and therapeutic management of primary bone lymphomas, that is lymphomas exclusively involving the skeleton, is sparse and fragmentary, mostly reported before worldwide use of rituximab and positron emission tomography (PET). The level of evidence supporting therapeutic decisions in primary bone lymphomas is very low as no prospective trials have been published. The relevant literature is almost exclusively constituted by small, retrospective series often furnishing conclusions on unreliable subgroup analyses, and with important interpretation biases due to stage migration and use of obsolete histopathological classifications. An additional bias regards the use of radiotherapy as exclusive treatment in unfit patients, whereas recent advances in supportive care have extended the number of patients treated with curative intent. As a consequence of these methodological caveats and the impossibility of conducting large prospective trials, several therapeutic questions remain open: the role of surgery and radiotherapy, the best radiation volumes and doses, the most effective chemoimmunotherapy combination, and prognostic factors, among others. In this complicated context, large, retrospective studies of cumulative, unselected series remain a valid tool to improve our knowledge on primary bone lymphomas.

This review is based on the analysis of the largest available database of bone lymphomas, established under the sponsorship of the International Extranodal Lymphoma Study Group (IELSG), as well as on the critical analysis of related literature. It provides recommendations for the diagnosis, staging, treatment, and response assessment of these patients, and addresses the management of special conditions like pathological fractures, indolent bone lymphomas and CNS dissemination risk in everyday practice.

Section snippets

Definition, incidence and epidemiology

Criteria used to define and classify primary bone lymphomas changed several times in the last decades. While there is general agreement that cases with a solitary lesion arising in a bone should be considered as a primary bone lymphomas, there is no consensus over the best categorization of cases with multifocal osseous disease or cases with concomitant soft tissue, visceral and/or lymph nodal infiltration [1], [2], [3], [4], [5]. In the previous version of the World Health Organization (WHO)

Clinical presentation

Table 1 summarizes the main patient characteristics at presentation reported in the largest available series of bone lymphomas [9], [26]. Although the tumour itself can affect fitness, particularly if it occurs in weight-bearing bones, most patients have ECOG performance status of 0–1. Pain is the most common presenting symptom (80–95%), tumour mass is present in 30–40% of cases and pathological fracture in 15–20%, with a mean duration of the period between symptoms and diagnosis of 8 months [11]

Diagnosis

A clinic-radiological suspicion of bone lymphoma must be confirmed by histopathological examination (morphological exam, immunohistochemistry and molecular analyses) of a diagnostic sample obtained by surgical procedure. This is mandatory to confirm lymphomatous nature and to define histotype since current knowledge and available radiologic tools do not allow a distinction among the different lymphoma categories involving the skeleton. Excision biopsy should be avoided; biopsies should be

Staging

Diagnostic tests and procedures in the initial work-up of patients with primary bone lymphomas are listed in Table 2. Stage of disease is defined according to the Ann Arbor staging system [71]. However, this staging system has some important limitations when attempting to analyze different stage subgroups and to compare reported studies. Based on their different prognosis and outcome (Fig. 1), the IELSG staging system has been proposed (Table 3), where bone lymphomas are classified into four

Prognosis

The survival of patients with primary bone DLBCL is significantly related to disease stage, with the 5-year overall survival (OS) varying from 82% for patients with stage-IE disease to 38% for patients with disseminated DLBCL and skeleton involvement (Fig. 1). In early-stage disease, relapses occur equally within and outside the primary sites of disease, with local and systemic relapse rate of 10% and 17%, respectively [72]. In polyostotic lymphomas, most relapses exclusively involve the

Stage IE-IIE DLBCL of the bone (or primary bone DLBCL)

Different strategies like chemotherapy, immunotherapy, surgery and radiotherapy have been used to treat primary bone DLBCL, a separate entity usually displaying favourable clinical features and good prognosis. The role of surgery in primary bone lymphomas is limited to sampling for histopathological diagnosis, stabilization and internal fixation of affected bone and resolution of pathological fracture (see below). The use of surgery instead of radiotherapy has been suggested in patients with

Response to treatment

Conventional radiologic and functional procedures exhibit limitations in the assessment of response to treatment in primary bone lymphomas patients; architectural osseous distortion can remain unchanged for many years in X-rays and CT scans, and residual uptake can persist in bone scintigraphy and 18FDG-PET (Fig. 2). Bone remodelling and artefacts due to stabilizing hardware complicate the assessment of local disease control; in particular, artefacts caused by intramedullary titanium rods

Late iatrogenic sequelae

Chronic pain, limb dysfunction and late pathological fracture are the most common iatrogenic sequelae in patients with bone lymphoma. The involvement of the femur, pelvis and the spine is more commonly associated with chronic symptoms, and a second pathological fracture after anti-lymphoma treatment has been recorded in 10% of patients with secondary bone DLBCL [75]. Such fractures can occur in the absence of local recurrence and can lead to persisting non-union with subsequent disability,

Conflict of Interest

The authors declared no conflict of interest.

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