Table 4. Association of BRCA1 and ERCC1 and the effect of radiochemotherapy in primary nasopharyngeal carcinoma and cervical lymph node.

Expression		Response
In primary		N	CR	PR	RR(%)	X2	P1
BRCA1
+		129	106	22	82.1	2.071	0.209
-		72	65	7	90.2
ERCC1
+		136	113	23	83.1	0.715	0.532
-		65	57	8	87.6
BRCA1	ERCC1
+	+	103	84	19	81.5	4.243	0.218
-	-	39	37	2	94.8
+	-	26	23	3	88.4
-	+	33	28	4	84.8
In cervical lymph node
BRCA1
+		129	118	11	91.4	1.356	0.387
-		72	69	3	95
ERCC1
+		136	123	13	90.4	3.437	0.108
-		65	64	1	98.4
BRCA1	ERCC1
+	+	103	91	12	88	3.370	0.338
-	-	39	38	1	97
+	-	26	24	2	92
-	+	33	31	2	93

¹Statistical analysis was estimated by χ2 test, and P < 0.05 was considered statistically significant; CR, complete response; PR, partial response; RR, response rate.