ERCC1 and Decreased total neutrophil count: However, the strongest factor for the recurrent neutropenia was the rare homozygote AA of the ERCC1 c.1510C>A polymorphism (rs3212986), responsible for the over 5-times higher risk when compared to genotypes with common allele C (OR 5.45; 95% CI 1.62–18.29; p = 0.006).