Distinct morphologic, phenotypic, and clinical-course characteristics of indolent peripheral T-cell lymphoma

Eiko Hayashi, Katsuyoshi Takata, Yasuharu Sato, Yukie Tashiro, Yoshiro Tachiyama, Seiko Sawada-Kitamura, Yasushi Hiramatsu, Shun Sugiguchi, Soichiro Nose, Mitsuyoshi Hirokawa, Midori Ando, Lamia Abd Alkader, Yoshinobu Maeda, Mitsune Tanimoto, Tadashi Yoshino

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


Peripheral T-cell lymphoma, not otherwise specified (PTCL-NOS) consists of a heterogeneous group of lymphomas. Patients generally show an aggressive clinical course and very poor outcome. Although the 2008 World Health Organization classification of PTCL-NOS includes 3 variants, low-grade lymphoma is not included. Of 277 PTCL-NOS cases recorded in our consultation files, we examined the clinicopathologic characteristics of 10 patients with T-cell lymphomas composed of small-sized cells with slight nuclear atypia. Eight patients showed extranodal involvement (5 patients, spleen; 3 patients, thyroid), and 5 patients were at clinical stage I or II. Histologically, all samples presented diffuse infiltrate of small lymphoid cells, with few mitotic figures. Immunohistologically, all samples were positive for CD3, and CD20 was detected in 5 samples. All samples showed a low Ki-67 labeling index (mean, 1.05%), and 7 samples were positive for central memory T-cell markers. Clonal T-cell receptor γ chain and/or α-β chain gene rearrangements were detected in all 10 patients. Five patients received chemotherapy, whereas for 3 patients, treatment consisted only of observation following surgical resection of the spleen or thyroid. Nine patients were alive at a median follow-up time of 19.5 months, whereas 1 patient died of an unrelated disease. The present study strongly indicates that T-cell lymphoma with small-sized lymphoma cells and a low Ki-67 labeling index is a distinct variant. Recognition of this novel lymphoma subtype, which should not be defined merely as PTCL-NOS, should be seriously considered.

Original languageEnglish
Pages (from-to)1927-1936
Number of pages10
JournalHuman Pathology
Issue number9
Publication statusPublished - Sep 2013


  • CD20
  • Good prognosis
  • Indolent PTCL
  • Ki-67
  • Memory T cell

ASJC Scopus subject areas

  • Pathology and Forensic Medicine


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