PMID: 9191519Jun 15, 1997Paper

The prognostic significance of intratumoral natural killer cells in patients with colorectal carcinoma

Cancer
Santiago CocaM Moreno

Abstract

Natural killer (NK) cells have a spontaneous cytotoxic capacity-against tumor cells. These cells represent a small proportion of human colon carcinoma-infiltrating lymphocytes. Their prognostic significance in these tumors has yet to be determined. One hundred and fifty-seven patients who each had a colectomy for large bowel adenocarcinoma were studied. No patient received adjuvant therapy. Immunohistochemical stains were performed for NK cells using the monoclonal antibody CD57. The number of NK cells was counted using a MICRON image analyzer. The total area studied for each tumor was 1 cm2. In this area, 50 intratumoral fields of 0.173 mm2 were selected. The degree of NK infiltration was classified as little (< 50 NK cells), moderate (50-150 NK cells), and extensive (> 150 NK cells). The Kaplan-Meier method was used to obtain survival figures. Multivariate analyses were performed using the Cox regression model. At 5 years, patients with little and moderate NK infiltration showed significantly shorter survival rates (overall and disease free survival) than those with extensive infiltration (P < 0.01). Three significant factors affecting survival were selected in a stepwise fashion in increasing order as follows: TNM stage, NK ...Continue Reading

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