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Table 2 Human papillomavirus (HPV)-positive and -negative metaplastic breast carcinomas

From: High-risk human papillomavirus (HPV) DNA sequences in metaplastic breast carcinomas of Mexican women

Histology HPV-16 HPV-18 HPV– Total
Carcinoma with chondroid differentiation 3 0 3 6
Adenosquamous carcinoma 2 0 0 2
Carcinoma with squamous differentiation 1 0 4 5
Spindle cell carcinoma 1 0 0 1
Matrix-producing bone carcinoma 0 1 0 1
Carcinoma with squamous/chondroid differentiation 0 0 2 2
Carcinoma squamous/sarcomatoid 0 0 1 1
Carcinoma with chondroid/osteoid differentiation 0 0 1 1
Carcinosarcoma 0 0 1 1
Total 7 1 12 20