Table 2

%Characteristics of 129 node-negative patients and tumors according to the results of RT-PCR

FactorsRT-PCR methodP
Micrometastasis (+) (n = 40)Micrometastasis (−) (n = 89)
Patient age (yrs)
Mean± SD50.1± 11.450.0± 12.60.9590a
Median47.048.0
≤50 yrs2354
>50 yrs17350.7339b
Menopausal status
Premenopause2251
Postmenopause18380.2478b
Tumor size (mm)
≤201537
>2025520.6627b
Histological type
Noninvasive ductal carcinoma07
Invasive ductal carcinoma3472
Papillo-tubular1731
Solid-tubular1029
Scirrhous7120.5529b
Other6100.1722b
Estrogen receptor status
Positive2150
Negative17260.2743b
Unknown213
Histological gradec
I726
II2753
III650.1095b
Lymphatic invasionc
Negative828
Positive32560.1262b
Vascular invasionc
Negative3572
Positive5120.7870b
Adjuvant therapy
Yes3564
No5250.0526b
  • a Student’s t test.

  • b χ2 test.

  • c Data from five patients were not available.