Annals of Oncology Advance Access originally published online on December 12, 2008
Annals of Oncology 2009 20(3):526-533; doi:10.1093/annonc/mdn677
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hematologic malignancies |
Soluble interleukin-2 receptor retains prognostic value in patients with diffuse large B-cell lymphoma receiving rituximab plus CHOP (RCHOP) therapy
1 Department of Medical Oncology and Hematology, Cancer Institute Hospital, Tokyo
2 Department of Epidemiology
3 Department of Transfusion Medicine, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama
4 Devision of Pathology, The Japanese Foundation for Cancer Research, Tokyo
5 Department of Hematology and Oncology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
* Correspondence to: Dr Kiyohiko Hatake, Department of Medical Oncology and Hematology, Cancer Institute Hospital, 3-10-6 Ariake Koto-ku, Tokyo 135-8550, Japan. Tel: +81-3-3520-0111; Fax: +81-3-3570-0343; E-mail: khatake{at}jfcr.or.jp
Background: Soluble interleukin-2 receptor (SIL-2R) is known to be a prognostic parameter in patients with diffuse large B-cell lymphoma (DLBCL) receiving cyclophosphamide, doxorubicin, vincristine and prednisone (CHOP) therapy. However, its prognostic value has not been well known since the introduction of rituximab.
Patients and methods: We retrospectively evaluated the prognostic impact of SIL-2R in 228 DLBCL patients, comparing 141 rituximab-combined CHOP (RCHOP)-treated patients with 87 CHOP-treated patients as a historical control.
Results: Patients with high serum SIL-2R showed significantly poorer event-free survival (EFS) and overall survival (OS) than patients with low SIL-2R in both the RCHOP group (2-year EFS, 66% versus 92%, P < 0.001; OS, 82% versus 95%, P = 0.005) and the CHOP group (2-year EFS, 40% versus 82%; OS, 61% versus 90%, both P < 0.001). Multivariate analysis including the five parameters of International Prognostic Index (IPI) and two-categorized IPI revealed that SIL-2R was an independent prognostic factor for EFS and OS in the RCHOP group as well as in the CHOP group.
Conclusions: Our results demonstrate that SIL-2R retains its prognostic value in the rituximab era. The prognostic value of SIL-2R in DLBCL patients receiving rituximab-combined chemotherapy should be reassessed on a larger scale and by long-term follow-up.
Key words: diffuse large B-cell lymphoma, rituximab, soluble interleukin-2 receptor
Received for publication July 5, 2008. Revision received September 11, 2008. Accepted for publication September 16, 2008.