- Tumor mutational signature analysis may be performed with any informatic tool available. The herein proposed recommendations have been tested with the results obtained with the web-based tool Signal (https://signal.mutationalsignatures.com/): For POLE variants the COSMIC v.3 signatures included in Signal were analyzed, which include, among others, SBS10a, 10b, 28, 14 and 20; for POLD1 variants the Cancer Reference Signatures (CRS) included in Signal were analyzed, which include, among others, SBS10a, 10d, 14 and 20. In any case, no selection of the cancer type should be performed