Table I.
Percentage distribution of Duffy (Fy) blood group system-associated SNPs by country of origin, ANC, cytokines, and ELA2rs57834246 allele status.
| CC | TC | TT | |||
|---|---|---|---|---|---|
| N | (n = 121), % | (n = 66), % | (n = 69), % | P-value | |
| Country (race) | |||||
| Barbados/Trinidad-Tobago | 45 | 69 | 20 | 11 | 0·0001 |
| Dominican Republic | 50 | 8 | 40 | 52 | |
| Haiti | 49 | 75 | 25 | 0 | |
| Jamaica | 35 | 63 | 37 | 0 | |
| United States (black) | 37 | 73 | 27 | 0 | |
| United States or Europe (white) | 40 | 0 | 5 | 95 | |
| Overall | 256 | 47 | 26 | 27 | |
| Median ANC (×109/l) | 2684 | 4212 | 3953 | <0·0001 | |
| % ANC ≤ 1500 × 109/l | 4·4 | 9·3 | 0 | 0 | 0·001 |
| TNF-α (pg/ml) | |||||
| Non-detectable | 134 | 48·5 | 28·4 | 23·1 | 0·65 |
| ≤233·3 | 63 | 47·6 | 22·2 | 30·2 | |
| >233·3 | 59 | 44·1 | 23·7 | 32·2 | |
| G-CSF (ng/ml) | |||||
| <0·0259 | 85 | 32·9 | 27·1 | 40·0 | 0·002 |
| 0·026–0·0381 | 82 | 47·6 | 24·4 | 28·0 | |
| >0·0381 | 84 | 59·5 | 26·2 | 14·3 | |
| CRP (μg/ml) | |||||
| <1·54 | 116 | 44·0 | 25·9 | 30·2 | 0·84 |
| 1·55–5·67 | 66 | 29·3 | 22·7 | 25·8 | |
| >5·67 | 64 | 46·9 | 28·1 | 25·0 | |
| ELA2 rs57834246 genotype | |||||
| CC | 168 | 36·3 | 25·6 | 38·1 | 0·0001 |
| CA or AA | 75 | 69·3 | 24·0 | 6·7 | |
ANC, absolute neutrophil count; SNPs, single nucleotide polymorphisms; CRP, C-reactive protein; G-CSF, granulocyte colony-stimulating factor; TNF-α, tumour necrosis factor-alpha.