The LRP1B minor allele rs7568970 had a significant protective effect against CIS (558 SNPs, Bonferroni-corrected p = 0.02) that resisted adjustment for confounding factors, including the amount of cocaine use (adjusted beta = −0.965 and −2.35 for heterozygotes and homozygotes, respectively, p < 0.01). The gene discussed is LRP1B; the disease is in situ carcinoma.