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Background <p>Primary small intestinal lymphoma (PSIL) is a rare disease, and its clinical characteristics and prognostic factors remain insufficiently defined because of limited large-scale data.</p> Methods <p>We conducted a nationwide multicenter retrospective study of 686 patients diagnosed with PSIL between January 2008 and December 2017 at 44 institutions in Japan. Clinical characteristics, histological subtypes, and overall survival were analyzed.</p> Results <p>B-cell lymphoma was the predominant immunophenotype (<i>n</i> = 623, 91%), whereas T-cell lymphoma was uncommon (<i>n</i> = 50, 7%). Diffuse large B-cell lymphoma (DLBCL) was the most frequent histological subtype (<i>n</i> = 330, 48%), followed by follicular lymphoma (FL) (<i>n</i> = 224, 33%). Compared with other B-cell lymphomas, FL was more common in women and more frequently involved the jejunum (<i>P</i> &lt; 0.001). The 5-year overall survival rate was significantly higher in patients with B-cell lymphoma than in those with T-cell lymphoma (81% vs. 23%, <i>P</i> &lt; 0.001). Multivariate Cox regression analysis identified age &gt; 60 years and T-cell lymphoma as independent adverse prognostic factors, whereas FL was an independent predictor of favorable overall survival.</p> Conclusions <p>This nationwide multicenter analysis delineates the clinicopathological features and survival outcomes of PSIL in Japan. FL represents the second most common subtype after DLBCL and is associated with a favorable prognosis among PSIL subtypes.</p>

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Multicenter retrospective analysis of primary small intestinal lymphoma in Japan

  • 期刊论文

  • 发表日期：

    2026年2月17日

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  • Masafumi Kitamura,
  • Tomonori Yano,
  • Shiro Oka,
  • Takehiro Torisu,
  • Akio Shiomi,
  • Kinichi Hotta,
  • Fumio Ishida,
  • Shin-Ei Kudo,
  • Takeshi Yamada,
  • Keigo Mitsui,
  • Masazumi Okajima,
  • Toshio Uraoka,
  • Hiroaki Nozawa,
  • Koichi Kurahara,
  • Hiroaki Ikematsu,
  • Masaaki Ito,
  • Keiichi Takahashi,
  • Shoichi Saito,
  • Masashi Ueno,
  • Shigeki Yamaguchi,
  • Yasumori Fukai,
  • Toshio Kuwai,
  • Shinji Nagata,
  • Yoichi Ajioka,
  • Tomohiro Kato,
  • Yoji Takeuchi,
  • Yojiro Hashiguchi,
  • Naoki Ohmiya,
  • Tomoki Yamano,
  • Michio Itabashi,
  • Eiji Sunami,
  • Eigo Otsuji,
  • Yukihide Kanemitsu,
  • Hiroyuki Takamaru,
  • Takayuki Matsumoto,
  • Tamotsu Sugai,
  • Masaya Kawai,
  • Takashi Yao,
  • Tetsuji Takayama,
  • Eiji Shinto,
  • Kazuo Ohtsuka,
  • Yusuke Kinugasa,
  • Kenichi Sugihara,
  • Motohiro Esaki,
  • Takeshi Kato,
  • Kazutomo Togashi,
  • Yoshito Akagi,
  • Hiroshi Kashida,
  • Takahiro Horimatsu,
  • Yusuke Saitoh,
  • Kazutaka Yamada,
  • Keiji Koda,
  • Madoka Hamada,
  • Koji Komori,
  • Akira Toyoshima,
  • Shinji Tanaka,
  • Hironori Yamamoto

摘要

Background

Primary small intestinal lymphoma (PSIL) is a rare disease, and its clinical characteristics and prognostic factors remain insufficiently defined because of limited large-scale data.

Methods

We conducted a nationwide multicenter retrospective study of 686 patients diagnosed with PSIL between January 2008 and December 2017 at 44 institutions in Japan. Clinical characteristics, histological subtypes, and overall survival were analyzed.

Results

B-cell lymphoma was the predominant immunophenotype (n = 623, 91%), whereas T-cell lymphoma was uncommon (n = 50, 7%). Diffuse large B-cell lymphoma (DLBCL) was the most frequent histological subtype (n = 330, 48%), followed by follicular lymphoma (FL) (n = 224, 33%). Compared with other B-cell lymphomas, FL was more common in women and more frequently involved the jejunum (P < 0.001). The 5-year overall survival rate was significantly higher in patients with B-cell lymphoma than in those with T-cell lymphoma (81% vs. 23%, P < 0.001). Multivariate Cox regression analysis identified age > 60 years and T-cell lymphoma as independent adverse prognostic factors, whereas FL was an independent predictor of favorable overall survival.

Conclusions

This nationwide multicenter analysis delineates the clinicopathological features and survival outcomes of PSIL in Japan. FL represents the second most common subtype after DLBCL and is associated with a favorable prognosis among PSIL subtypes.