BACKGROUND. Macrophages often infiltrate into solid tumor tissues. Tumor-as
sociated macrophages (TAMs) are known to play a crucial role in tumor progr
ession. Monocyte chemoattractant protein-1 (MCP-1) is one of the major chem
okines capable of inducing chemotactic migration of monocytes.
METHODS. With the objective of investigating the clinical significance of M
CP-1, the authors analyzed the expression of MCP-1 and of some other molecu
les by immunohistochemistry in 230 samples of primary breast carcinoma tiss
ue. MCP-1 staining was performed using an anti-MCP-1 monoclonal antibody, a
nd it was Department of Surgery, Breast Oncology Unit, assessed by grading
the percentage of stained cells.
RESULTS. It was found that 117 breast tumor specimens (51%) had intensive s
taining in tumor cells. The expression of MCP-1 in tumor cells had a signif
icant correlation with the expression of thymidine phosphorylase and membra
ne type 1-matrix. metalloproteinase. In addition, MCP-1 expression tended t
o be associated with the accumulation of TAMs, which were counted by CD68 s
taining, and with microvessel density. MCP-1 expression in TAMs was correla
ted significantly with the histologic vessel invasion of tumor cells.
CONCLUSIONS. The results of this study suggest that MCP-1 may play key role
s in macrophage recruitment, in the expression of angiogenic factors, and i
n the activation of matrix metalloproteinases in patients with breast carci
noma. (C) 2001 American Cancer Society.