Table 5. The correlation between gefitinib trough concentration and toxicity.

Ctrough	Grade 0 V 1+			Grade 0 to 1 V 2+
	OR	95% CI	P	OR	95% CI	P
Rash	0.921	0.300–2.826	0.885	0.851	0.296–2.442	0.764
Diarrhea	1.461	0.488–4.377	0.498	0.974	0.083–11.435	0.983
Hepatotoxicity	1.111	0.332–3.715	0.864	0.301	0.034–2.640	0.279