Age

18–any

Sex

ALL

Healthy volunteers

Not accepted

o All stages of NSCLC
* Stage III-IV NSCLC eligible for ICI treatment
* 18 years or older; non pregnant women
* in stage III-IV: no previous ICI and before ICI (mono- or combination therapy) initiation
* Signed informed consent
* Clinical, biological and radiological evaluation at the CHU de Liège for at least 6 months following treatment initiation

Probable noncompliance with the follow-up requirements of the study (psychiatric condition, socio-economic factors)
Inclusion in a clinical study contraindicating the enrolment in the PROTEON study

PROspective Trial on EOsinophilia in Non-Small Cell Lung Cancer (NSCLC).