Clinicopathologic factor and Lymphovascular Invasion in Breast cancer / 한국유방암학회지

ABSTRACT

PURPOSE: Clinicopathologic factors associated with prognosis in breast cancer patients have varied. Among clinicopathologic factors, lymphovascular invasion (LVI) has been suggested to be a significant prognostic indicator for breast cancer. LVI means that cancer cells were found invading the lymphatics in the breast parenchyma adjacent to or well beyond the margin of the invasive tumor, and this can be an indicator of an increased chance that cancer could spread, as is demonstrated by the positive lymph nodes. The objective of this study was to determine whether LVI are associated with other clinicopathologic factors in breast cancer. METHODS: The expression of HER-2, Ki-67, P53, estrogen receptor and progesterone receptor was determined immunohistochemically in 120 breast cancer patients, including 77 patients that demonstrated the absent of LVI and 43 patients with the present of LVI. RESULTS: LVI was noted in 43 patients (35.8%) of the 120 breast cancer patients. Of the 77 patients with absent of LVI, the number of stage III patients (13 patients, 16.9%) was lower than the number of stage I (25 patients, 32.5%) and stage II breast cancer patients (39 patients, 50.6%). Of the 43 patients with absent of LVI, 5 patients (11.6%), 13 patients (30.2%), and 25 patients (58.2%) were in stage I, II, and III, respectively. There was a significant correlation between LVI and the stage (P=0.000). The strong expression (+3) of HER-2 was seen in 17 (39.5%) of the 43 patients in whom LVI was seen and in 15 (19.5%) of the 77 patients in whom LVI was not seen. Overexpression of Ki-67 was noted in 42 (97.7%) of the 43 patients in whom LVI was seen and in 64 (83.1%) of the 77 in whom LVI was not seen. HER-2 and Ki-67 overexpression was significantly associated with LVI (p=0.027 and p=0.018, respectively). LVI did not correlate with the expression of P53, the estrogen receptor status and the progesterone receptor status. There was a strong association of LVI and the lymph node status (p=0.000). Finally, LVI was associated with tumor size (p=0.014) and with the nuclear grade (p=0.022). CONCLUSION: This study demonstrates the potential value of the lymph nodal status, tumor size, stage and nuclear grade for the assessment of lympho-vascular invasion; and the overexpressions of HER-2 and Ki-67 were strong indicators of LVI in invasive ductal carcinoma of the breast.