Differential risk of non-Hodgkin's lymphoma in Italian patients with primary Sjogren's syndrome

Guido Valesini, Roberta Priori, Daphné Bavoillot, John Osborn, M. Giovanni Danieli, Nicoletta Del Papa, Roberto Gerli, Maurizio Pietrogrande, Maria Grazia Sabbadini, Francesco Silvestris, Laura Valsecchi

Research output: Contribution to journalArticlepeer-review


Objective. To assess the incidence of non-Hodgkin's lymphoma (NHL) and estimate there relative risk (RR) of developing lymphoproliferative complications in a large population of Italian patients with Sjogren's syndrome (SS) and to ascertain if any difference exists between the north and centre-south of Italy. Methods. Differential relative risks of NHL were obtained by comparing the number of observed cases with cases identified on the basis of age-sex-time specific incidence rates extracted from regional cancer registries. Results. Among the 331 patients with SS studied, 9 cases of NHL occurred, while no lymphoid malignancy appeared in patients with overlapping connective tissue disease (secondary SS) or in males with primary SS. As the number of NHL cases identified on the basis of the rate in the cancer registries would have been 0.27, the RR is 33.3 (p <0.001). The incidence rate of NHL in Italian patients with SS is about 5.1/1000 person- years, 5.4/1000 per year in the north of the country and 4.8/1000 per year in the centre-south. The relative risks are, respectively, 34.7 and 32.5. Conclusion. Italian patients with primary SS have increased risk of developing NHL. In this group, the absence of a significant difference between the north and the centre-south of Italy contrasts with the higher incidence of NHL in the general population of northern regions and strengthens the direct connection between primary SS and NHL.

Original languageEnglish
Pages (from-to)2376-2380
Number of pages5
JournalJournal of Rheumatology
Issue number12
Publication statusPublished - Dec 1997


  • Italy
  • Lymphoproliferation
  • Non-Hodgkin's lymphoma
  • Sjogren's syndrome

ASJC Scopus subject areas

  • Rheumatology
  • Immunology


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