Medical Oncology

, 30:743

Peripheral CD45RO, PD-1, and TLR4 expression in metastatic colorectal cancer patients treated with bevacizumab, fluorouracil, and irinotecan (FOLFIRI-B)

  • Vincenzo Formica
  • Vittore Cereda
  • Maria-Giovana di Bari
  • Italia Grenga
  • Manfredi Tesauro
  • Palmirotta Raffaele
  • Patrizia Ferroni
  • Fiorella Guadagni
  • Mario Roselli
Original Paper

Abstract

CD45RO, PD-1, and TLR4 immune pathways have proven pivotal in regulating antitumor response and correlate with survival for localized colorectal cancer (CRC). We evaluated if their peripheral expression was associated with outcome in metastatic CRC (mCRC). Thirty-one mCRC patients were eligible for this prospective study (clinicaltrial.gov NCT01533740) and treated with first-line FOLFIRI-B. Blood was drawn before the first and third cycle and analyzed by flow cytometry for frequency (%) of CD4+, CD8+, CD45RO+, and PD1+ mononuclear cells and for TLR4 expression on neutrophils. Two cycles of chemotherapy determined changes in immune variables that were prognostically meaningful. Pre-third-cycle (ptc) CD45RO+CD8+cell% displayed a statistically significant association with progression-free survival (PFS) (median PFS 22.4 vs. 9.4 months for patients with CD45RO+CD8+cell%> vs. <the median value of 12 %, respectively, p 0.02) and overall survival (OS) (2-year OS rate 62 vs. 44 %, respectively, p 0.04). Surprisingly, ptc-PD1 overexpression was also associated with improved PFS of borderline statistical significance (HR 0.42, p 0.06). A Cox regression multivariate analysis for PFS including ptc-CD45RO+CD8+cell%, ptc-PD1+cell%, CEA, LDH, and Köhne risk class demonstrated CD45RO+CD8+cell% to be the only independent prognostic factor (HR 0.23, p 0.04). TLR4 and CD4 were not associated with the outcome. Peripheral CD8+CD45RO+ cells were confirmed to be of independent prognostic value in mCRC patients. Overexpression of the PD-1 immunosuppressor after two cycles of therapy may be a negative feedback mechanism, and therefore, an indirect sign of chemotherapy induced antitumor immune response with a favorable association with outcome. Enhancement of CD8+CD45RO+ cell response may be a fascinating therapeutic target to improve the efficacy of FOLFIRI-B.

Keywords

CD45RO PD-1 TLR4 Colorectal cancer 

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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • Vincenzo Formica
    • 1
    • 4
  • Vittore Cereda
    • 1
  • Maria-Giovana di Bari
    • 2
  • Italia Grenga
    • 1
  • Manfredi Tesauro
    • 3
  • Palmirotta Raffaele
    • 2
  • Patrizia Ferroni
    • 2
  • Fiorella Guadagni
    • 2
  • Mario Roselli
    • 1
  1. 1.Medical Oncology Unit, ‘Tor Vergata’ Clinical CenterUniversity of RomeRomeItaly
  2. 2.Department of Advanced Biotechnologies and BioimagingIRCCS San Raffaele PisanaRomeItaly
  3. 3.Internal Medicine Department, ‘Tor Vergata’ Clinical CenterUniversity of RomeRomeItaly
  4. 4.Medical Oncology Unit, Department of Internal Medicine‘Tor Vergata’ University HospitalRomeItaly

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