- A study on the biological behavior of human brain tumors. Part II: Steroid receptors and arachidonic acid metabolism. Butti, G., Gaetani, P., Chiabrando, C., Assietti, R., Zibera, C., Castelli, M.G., Gibelli, N., Silvani, V., Robustelli della Cuna, G., Paoletti, P. J. Neurooncol. (1991)