Aromatase inhibition by Letrozole or by other AIs, Anastrazole and Exemestane, the latter being a steroidal irreversible inhibitor [32], enhanced lymphoma growth similar to the results seen in intact C57BL6 mice using a murine T cell lymphoma (Figure 3). The gene discussed is CYP19A1; the disease is T-cell non-Hodgkin lymphoma.