TITLE

Immune restoration in head and neck cancer patients after in vivo COX-2 inhibition

AUTHOR(S)
Lang, Stephan; Tiwari, Sanjay; Andratschke, Michaela; Loehr, Iren; Lauffer, Lina; Bergmann, Christoph; Mack, Brigitte; Lebeau, Annette; Moosmann, Andreas; Whiteside, Theresa L.; Zeidler, Reinhard
PUB. DATE
October 2007
SOURCE
Cancer Immunology, Immunotherapy;Oct2007, Vol. 56 Issue 10, p1645
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
To determine the immunomodulatory effects of in vivo COX-2 inhibition on leukocyte infiltration and function in patients with head and neck cancer. Patients with squamous cell carcinoma of the head and neck preoperatively received a specific COX-2 inhibitor (rofecoxib, 25 mg daily) orally for 3 weeks. Serum and tumor specimens were collected at the start of COX-2 inhibition (day 0) and again on the day of surgery (day 21). Adhesion to peripheral blood monocytes to ICAM-1 was examined. Percentages of tumor-infiltrating monocytes (CD68, CCR5) and lymphocytes (CCR5, CD4, CD8 and CD25) were determined by immunohistochemistry. Monocytes obtained from untreated cancer patients showed lower binding to ICAM-1 compared to monocytes of healthy donors but significantly regained adhesion affinity following incubation in sera of healthy donors. Conversely, sera of cancer patients inhibited adhesion of healthy donors’ monocytes. Tumor monocyte adhesion to ICAM-1 was increased ( P < 0.001) after 21 days of COX-2 inhibition, and concomitant increases in tumor infiltrating monocytes (CD68+), lymphocytes (CD68− CCR5+, CD4+ and CD8+) and activated (CD25+) T cells were observed. Short-term administration of a COX2 inhibitor restored monocyte binding to ICAM-1 and increased infiltration into the tumor of monocytes and Th1 and CD25+ activated lymphocytes. Thus, in vivo inhibition of the COX-2 pathway may be useful in potentiating specific active immunotherapy of cancer.
ACCESSION #
25849321

 

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