CTNNB1 and neoplasm: The plasmatic concentration of total cfDNA was not correlated with age (p = 0.2754 – Spearman), size of the tumor (p = 0,1226 – Spearman), abdominal or extra-abdominal location (p = 0,3825 – Mann–Whitney), CTNNB1 mutations type (p = 0,2563 – Mann–Whitney), presence or absence of a detectable CTNNB1 mutant in cfDNA (p = 0,7263 – Mann–Whitney) and between the different institutions from which the samples were collected (p = 0,1594 – Mann–Whitney), Figure 1.