CALIF study is a monocentric observational study which aim is to analyse the value of adding procalcitonin (PCT, a pre-hormon increased in bacterial infection and septicaemia) in the management of chemo-induced febrile neutropenia occurring in patient with solid tumour. Febrile neutropenia will be managed according to international guidelines. PCT will be dosed at initial presentation. Primary objective is to determine the optimal value of PCT for the detection of septicaemia in low risk (according to MASCC score). The investigators plan also to compare two risk stratification scores: the validated MASCC score and a recently developed score which includes PCT and other more objective items.