Combination of CD47 and signal-regulatory protein-α constituting the “don’t eat me signal” is a prognostic factor in diffuse large B-cell lymphoma

Ryo Kazama, Hiroaki Miyoshi, Mai Takeuchi, Kohta Miyawaki, Kazutaka Nakashima, Noriaki Yoshida, Keisuke Kawamoto, Eriko Yanagida, Kyohei Yamada, Takeshi Umeno, Takaharu Suzuki, Koji Kato, Jun Takizawa, Masao Seto, Koichi Akashi, Koichi Ohshima

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)


The interaction between CD47 and signal-regulatory protein-α (SIRPα) inhibits phagocytosis, thus affecting the clinical outcomes of neoplastic diseases. Although CD47 upregulation is associated with poor prognosis in several malignancies, the effect of SIRPα expression and its coexpression with CD47 remains unclear. This study aimed to investigate the clinicopathologic effect of CD47 and SIRPα expression in diffuse large B-cell lymphoma (DLBCL). Immunostaining of 120 biopsy samples showed that CD47 is primarily expressed in tumor cells, whereas SIRPα is expressed in nonneoplastic stromal cells, mostly macrophages. CD47high cases showed higher MYC protein expression and lower MYC translocation. The SIRPαhigh cases presented significantly shorter overall survival (OS) and progression-free survival (PFS) than SIRPαlow cases in the activated B-cell (ABC) subtype of DLBCL (P =.04 and P =.02, respectively). Both CD47high and SIRPαhigh presented significantly shorter OS and PFS than other cases among all DLBCL patients (P =.01 and P =.004, respectively), and the ABC type (P =.04 and P =.008, respectively) but not the germinal center B-cell type. Both CD47high and SIRPαhigh yielded a constant independent prognostic value for OS and PFS in multivariate analysis (hazard ratio [HR], 2.93; 95% confidence interval [CI], 1.20-7.43; P =.02; and HR, 2.87; 95% CI, 1.42-5.85; P =.003, respectively). To the best of our knowledge, this is the first study to report that combinatorial CD47 and SIRPα expression is a potential independent prognostic factor for DLBCL. Evaluation of CD47 and SIRPα expression could be useful before CD47 blockade therapy.

Original languageEnglish
Pages (from-to)2608-2619
Number of pages12
JournalCancer Science
Issue number7
Publication statusPublished - Jul 1 2020

All Science Journal Classification (ASJC) codes

  • Oncology
  • Cancer Research


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