borderline significanceP = .056
When we combined these two loci to estimate their joint effects on OS, patients carried two unfavourable genotypes (ie the PSEN1 rs165934 AA and MAML2 rs76032516 AC/CC) had a higher death risk (HR = 2.34, 95% CI = 1.53‐3.59, P < .001) than those without unfavourable genotype; patients carried one unfavourable genotype also had a higher death risk with a borderline significance (HR = 1.32, 95% CI = 0.99‐1.77, P = .056) than those without unfavourable genotype; and the trend test was statistically significant ( P < .001).