Like other surname projects at Family Tree DNA, this is primarily for men who have tested their Y-DNA. The results of Y-DNA testing can help to identify a common genetic signature along the paternal line (that the son gets from his father's DNA, and his grandfather's DNA, etc).

https://www.familytreedna.com/products/y-dna

Determining whether individuals with the Cumbo surname and Maltese or Italian ancestry on their paternal line share a common genetic signature is the current goal of this project.