Table 2. Association between RRM1 expression and clinicopathologic features of 48 NPC patients.

Characteristic	RRM1–negative	RRM1-positive	χ2 test P value
Gender			0.975
Men	24	14
Women	7	3
Age (years)			0.632
≥ 47	15	7
< 47	16	10
ECOG performance status			0.202
0	16	12
1	15	5
Prior radiotherapy			0.272
Yes	23	10
No	8	7
Prior chemotherapy cycles			0.867
≤ 6	19	10
> 6	12	7
Number of prior chemotherapy regimens			0.339
1	10	3
≥ 2	18	13
Number of distant metastases			0.464
1	18	8
≥ 2	13	9
Gemcitabine cycles			0.839
≤ 4	21	12
> 4	10	5

Footnotes as in Table 1