The question at Quora was:

How vulnerable are salamanders to cancer?

My answer was:

There aren’t many large-scale epidemiological studies of cancer in salamanders and newts (urodeles), but they certainly get cancer, and the overall picture is that they are intermediate in their susceptibility to it.

Anuran and urodele amphibians develop spontaneous neoplasms in all major organ systems with the integumentary system a frequent target. … Anurans seem to have a greater frequency of spontaneous neoplasms than do urodeles …

Amphibian tumors: a comparison of anurans and urodeles.

Incidence of pigmented skin tumors in a population of wild Montseny brook newt (Calotriton arnoldi).

As well as these population studies, there are a reasonable number of case reports of tumors in urodeles as well.