Similarly, in veterinary medicine, the relationship between the expression of P-gp in duodenal samples of dogs with CE and the lack of response to treatment with steroids has been demonstrated by Allenspach et al. [10], who showed how lower levels of P-gp expression in duodenal lamina propria lymphocytes before treatment correlated with a good prognosis. The gene discussed is PGP; the disease is cholesteryl ester measurement.