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Immunohistochemical Assessment of ER-a Expression in Mouse Lung Tumors Induced by In Utero Arsenic Exposure or by DEN Treatment in Adulthood
| Group | n | Strongly positive | Variably positive | Negative |
|---|---|---|---|---|
| Arsenic induced | 6 | 5* | 1 | 0 |
| DEN induced | 3 | 0 | 0 | 3 |
Note. The asterisk (*) indicates a significant (p < 0.05) difference from incidence rates for DEN-induced tumors (Fischer's exact test, two sided).
