Table 5.

Relationship between previous chemotherapy and each adverse event

	Previous chemotherapy		P-value	Odds ratio
	+	−
Liver damage	7	2	0.009*	14
Skin rash	4	6	0.780	0.89
Diarrhea	2	2	0.853	1.5
Acute lung injury	1	1	0.802	1.4

Note: Previous chemotherapy was significantly correlated with gefitinib-induced liver damage (odds ratio = 14).

^*P < 0.05.