CNTN2 and neoplasm: Interestingly, no significant difference in tumor-free survival between Tax+p53+/− and Tax+p53+/+ mice was found (p = 0.7093; Gehan-Breslow-Wilcoxon test); this finding agrees with our previous tumorigenesis study of p53+/− and p53+/+ mice [69] that, in the context of our mice, we find no significant functional difference between homozygosity versus heterozygosity in wild type p53.