Tumor presence increased mRNA levels of ATF4 (87.76%, p < 0.001) and GADD34 (301.20%, p < 0.001) in skeletal muscle (Figure 4a) but only GADD34 mRNA expression was induced in the heart (48.10%, p = 0.033; Figure 4b). This evidence concerns the gene PPP1R15A and neoplasm.