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Table 1 Frequency of MMTV env sequence in relation to age of patient, grade of cancer and lymph node metastasis

From: Prevalence of Mouse Mammary Tumor Virus (MMTV)-like sequences in human breast cancer tissues and adjacent normal breast tissues in Saudi Arabia

Variables frequency of MMTV env positivity in both tumor and normal tissue (n = 6/103)
5.8%
frequency of MMTV env positivity in tumor (n = 0/103)
0.0%
frequency of MMTV env positivity in normal tissue (n = 3/103)
2.9%
Total (n = 9/103)
8.7%
Age (years)
 20–29 0 0 0 0
 30–39 1 (16.7%) 0 1 (33.3%) 2 (22.2%)
 40–49 1 (16.7%) 0 2 (66.7%) 3 (33.3%)
 50–59 3(50.0%) 0 0 3 (33.3%)
 60–69 0 0 0 0
 70–79 1 (16.7%) 0 0 1 (11.1%)
P-value 0.35a -(None reported as the observed positivity is zero) 0.50a 0.45a
Grade
 1 0 0 1 (33.3%) 1 (11.1%)
 2 2 (33.3%) 0 2 (66.7%) 4 (44.4%)
 3 4 (66.7%) 0 0 4 (44.4%)
p-value 0.69a 0.34a 0.91a
Presence of lymph nodes metastasis
 No 6(100.0%) 0 2 (66.7) 8 (88.9%)
 Yes 0 0 1(33.3%) 1 (11.1%)
p-value 0.003a 0.60a 0.002a
  1. aFisher’s exact due to small numbers