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352

J. Pijpe et al.

 

 

Fig. 20.5 Progression-free survival in patients with MALTÐSS and low SS disease activity (n = 29) and in patients with MALTÐSS and high disease activity

(n = 6), p < 0.05. Events are deÞned as progression of MALT lymphoma and/or increased SS activity with extraglandular disease

development of lymphoma or progression of extraglandular SS activity (Fig. 20.5) [42]. Our experience suggests that rituximab monotherapy may not be sufÞcient in the long-term treatment of patients with MALT lymphoma and SS with severe extraglandular manifestations, such as vasculitis, nephritis, or polyneuropathy. SpeciÞcally, rituximab alone may be insufÞcient for the control of the extraglandular SS manifestations.

In our experience treatment in these patients should include more intensive immunosuppressive therapy, for instance, a combination of rituximab with cyclophosphamide and prednisone (RÐCP). This combination therapy is effective in the treatment of both indolent lymphoma and autoimmune disease and usually consists of 6Ð8 intravenous infusions of 375 mg/m2 of rituximab and 750 mg/m2 of cyclophosphamide, one infusion given every 3Ð4 weeks, in combination with 100 mg prednisone for 5 days [59, 60]. We chose to exclude vincristine because of polyneuropathy as side effect. In patients with indolent non-HodgkinÕs lymphoma, maintenance therapy with antibodies after induction therapy with rituximab or cyclophosphamide, vincristine, and prednisone prolongs the time to progression but does not prolong survival [62]. Furthermore, the optimal maintenance regimen remains to be determined [63].

20.5Summary/Pearls

20.5.1Risk Factors for MALT–SS Development

¥ Persistent parotid gland swelling, palpable purpura, low levels of C4, and severe extraglandular manifestations (Table 20.1).

20.5.2 Diagnostic Work-up of MALT–SS

¥Diagnosis of MALT lymphoma requires histology (parotid gland biopsy).

¥Imaging (MRI) in patients with MALT lymphoma shows a diffuse or localized lesion in the gland with multiple cysts.

¥Patients with MALT lymphoma of salivary glands must also be evaluated for SS activity.

¥Relevance of full systemic staging and bone marrow biopsy is questionable.

¥Cervical lymph node involvement is associated with worse prognosis.

20.5.3Treatment and response evaluation of MALT–SS

¥Treatment strategy is dependent on both SS disease activity and MALT symptomatology (see Fig. 20.3).

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