Table 3 

Distributions of genotypes of the MNS16A between the subgroups of cases^{a }with different progression of nasopharyngeal carcinoma (NPC) 

NPC stage 
LL^{b }n (%) 
SL + SS^{b}, n (%) 
χ^{2c} 
P 


Clinical 

I 
36 (90. 0) 
2 (10. 0) 
1. 554 
0. 21 
II 
334 (89. 8) 
38 (10. 2) 

III 
212 (90. 2) 
23 (9. 8) 

IV 
143 (93. 5) 
10 (6. 5) 

Tumor (T) 
3. 314 
0. 069 

T1 
151 (91. 5) 
14 (8. 5) 

T2 
356 (89. 9) 
40 (10. 1) 

T3 
139 (89. 7) 
16 (10. 3) 

T4 
79 (96. 3) 
3 (3. 7) 

Node(N) 
0. 667 
0. 41 

N0 
148 (89. 2) 
18 (10. 8) 

N1 
350 (91. 1) 
34 (8. 9) 

N2 
156 (90. 7) 
16 (9. 3) 

N3 
71 (93. 4) 
5 (6. 6) 

Metastasis(M) 
0. 000 
1. 00 

M0 
708 (90. 9) 
71 (9. 1) 

M1 
17 (89. 5) 
2 (10. 5) 



^{a}Owing to genotyping failure, the actual sample size of the cases was 798. ^{b}L allele, 302 or 333 bp; S allele, 243 or 272 bp. ^{c}Comparisons of genotype distributions between the different subgroups were performed using the χ^{2 }test. The degrees of freedom for the clinical, T and N stages is 3, and for the M stage is 1 

Zhang et al. BMC Medicine 2011 9:106 doi:10.1186/174170159106 