Clinical significance of tryptophan catabolism in Hodgkin lymphoma

Ayako Masaki, Takashi Ishida, Yasuhiro Maeda, Asahi Ito, Susumu Suzuki, Tomoko Narita, Shiori Kinoshita, Hisashi Takino, Takashi Yoshida, Masaki Ri, Shigeru Kusumoto, Hirokazu Komatsu, Hiroshi Inagaki, Ryuzo Ueda, Ilseung Choi, Youko Suehiro, Shinsuke Iida

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Indoleamine 2,3-dioxygenase 1 (IDO) is an enzyme catabolizing tryptophan (Trp) into the kynurenine (Kyn) pathway. The purpose of the present study was to determine the clinical significance of Trp catabolism in newly diagnosed Hodgkin lymphoma (HL) patients. We quantified serum Trp and Kyn in 52 HL patients, and analyzed their associations with different clinical parameters including serum soluble CD30 concentration. The IDO expression was evaluated in the patients’ affected lymph nodes. The cohort comprised 22 male and 30 female patients (age range, 15-81 years; median, 45 years), with a 5-year overall survival (OS) of 88.6%. The OS was significantly shorter for patients with a high Kyn/Trp ratio (OS at 5 years, 60.0% vs 92.2%), for those with stage IV disease, and for those with lymphocytopenia (<600/mm3 and/or <8% white blood cell count). The latter two parameters are components of the international prognostic score for advanced HL. In contrast, there were no significant differences in OS according to age, serum albumin, hemoglobin, sex, white blood cell count, or serum soluble CD30 (≥ or <285.6 ng/mL). Multivariate analysis using the three variables stage, lymphocytopenia, and serum Kyn/Trp ratio showed that only the latter significantly affected OS. Indoleamine 2,3-dioxygenase 1 was produced by macrophages/dendritic cells, but not by HL tumor cells, and IDO levels determined by immunohistochemistry had a significant positive correlation with the serum Kyn/Trp ratio. In conclusion, quantification of serum Kyn and Trp is useful for predicting prognosis of individual HL patients.

Original languageEnglish
Pages (from-to)74-83
Number of pages10
JournalCancer science
Volume109
Issue number1
DOIs
Publication statusPublished - 01-2018

All Science Journal Classification (ASJC) codes

  • Oncology
  • Cancer Research

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