Serum Concentration of Erlotinib and its Correlation with Outcome and Toxicity in Patients with Advanced-stage NSCLC

Abstract

Background: Erlotinib is a tyrosine kinase inhibitor targeting epidermal growth factor receptor (EGFR); it is used in the treatment of advanced non-small cell lung cancer (NSCLC). We focused on the role of serum concentration of erlotinib and its association with outcome and toxicity in patients with advanced NSCLC harbouring the wild-type EGFR gene or squamous histology.

Patients and methods: Clinical data of 122 patients were analyzed. Serum samples were collected within four weeks after the initiation of treatment.

Results: There was no significant association of erlotinib concentration with PFS nor OS (p=0.352 and p=0.6393). Significant associations of erlotinib concentration with grade of skin rash and diarrhoea (p<0.0001 and p<0.0001) were found. Skin rash and diarrhoea were significantly associated with PFS (p=0.0338 and p=0.0001) and OS (p=0.0064 and p=0.0353).

Conclusion: Erlotinib concentration was not associated with outcome. Erlotinib concentration was associated with occurrence and severity of skin rash and diarrhoea; the outcome was associated with erlotinib toxicity.

Keywords: Erlotinib; NSCLC; diarrhoea; lung cancer; serum concentration; skin rash; survival; toxicity.