2014). Another study indicated the sensitivity, accuracy and specificity of CEA in diagnosing malignant CMTs to be 44.6%, 68.1% and 84.1%, respectively (Jain et al. 2021). CEA can be detected through various diagnostic techniques in both tissue and serum samples. qPCR analysis revealed higher CEA mRNA levels in bitches with malignant tumours compared to healthy ones (Lopuszynski et al. 2015). This evidence concerns the gene CEACAM5 and cancer.