(ii) AhR Function: In many tumor types, the AhR alone exhibits tumor promoter or tumor suppressor like activity (Table 1) [73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89], and this can be observed in animals or cells after knockdown or overexpression studies [33,34]. The gene discussed is AHR; the disease is neoplasm.