In terms of pathological characteristics, the <i>ABCC1</i> SNP rs35628 and the <i>ABCB1</i> SNP rs2032582 were significantly associated with tumor size, the <i>ABCC2</i> SNP rs2273697 was significantly associated with estrogen receptor status, and the <i>ABCG2</i> SNP rs2231142 was significantly associated with axillary lymph node status.
We identified a significant association for rs162561, an intronic SNP located in the cytochrome P450 family 1 subfamily B member 1 (CYP1B1) gene, with tumor response in patients treated with single-agent docetaxel (dominant model: β=1.02, 95% confidence interval=0.49-1.55; P=1.77×10(-4)), and for rs717620, an SNP located in the promoter of the ATP-binding cassette subfamily C member 2 (ABCC2) gene, in patients treated with neoadjuvant doxorubicin (recessive model: β=1.67; 95% confidence interval=0.26-3.11; P=0.02).
In this study, we investigated the association of three putative functional polymorphisms of ABCC2 (C-24T, G1249A, and C3972T) with tumor response and occurrence of the grade 3 or 4 toxicity in 445 patients with stage III and IV NSCLC treated with platinum-based chemotherapy.