CYP19A1 and T-cell non-Hodgkin lymphoma: To demonstrate that aromatase inhibition indeed stimulates lymphoma growth and that it is not specific for Letrozole, or that the effect on lymphoma growth is not restricted to the murine T cell lymphoma EG7 but also affects human B cell lymphoma and, finally, is not dependent on an intact immune system, we grafted immune deficient NSG mice with human lymphoma B cells (Granta-519).