Journal
CLINICAL CANCER RESEARCH
Volume 22, Issue 24, Pages 6290-6297Publisher
AMER ASSOC CANCER RESEARCH
DOI: 10.1158/1078-0432.CCR-16-0732
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- Canadian Cancer Society Research Institute [702375]
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Purpose: CD103 is expressed in several immune cell types but in the context of the intratumoral immune response may be most important as a marker of antigen-activated CD8 T cells. Methods: We have examined the prognostic significance of CD103 TILs in breast cancer by IHC in a cohort of 424 breast cancer patients. Results: CD103 TILs were present in all subtypes but were more abundant in ER-negative tumors where CD103 TILs were preferentially localized to the intraepithelial compartment. CD103 was associated with tumor size, tumor grade, and ER/PR status (P < 0.05). CD103 TIL density and the epithelial to stromal ratio was highest in the basal-like tumors. Intraepithelial CD103 but not intrastromal CD103 was associated with better relapse-free and overall survival in basal-like subtype tumors [HR = 0.28; 95% confidence interval (CI), 0.17-0.72; P = 0.0047 and HR = 0.25; 95% CI, 0.17-0.66; P = 0.0017, respectively). CD8 status showed similar but less significant associations, but the combination of dual CD103(+)CD8(+) TIL status was the most strongly prognostic combination for relapse-free and overall survival (HR = 0.10; 95% CI, 0.07-0.62; P = 0.006 and HR = 0.09; 95% CI, 0.07-0.57; P = 0.003, respectively). Conclusions: CD103 TILs are indicative of a good prognosis specifically within the basal-like subtype of breast cancer. (C)2016 AACR.
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