Nivolumab-induced acute neutrophilic gastritis: Case report in a tertiary hospital Asunción Ojeda Gómez; Maria Isabel Pamies Ramón; Alicia Brotons Brotons; Nuria Jiménez García; Maria Dolores Picó Sala; María Cabezas Macian; Javier Sola Vera Sánchez; Mariana Fe García Sepulcre;