Serum analysis of mice that developed cancer showed, in parallel with the others, increased insulin (z = +5.06, p < 1 × 10−4) and C-peptide levels (z = +4.42, p < 1 × 10−4) and decreased glucose and leptin levels (z = −2.89, p = 0.004 and z = −2.99, p = 0.003, respectively). The gene discussed is INS; the disease is cancer.