Here is the NATURE research paper, that accidently proved that (hydroxy)chloroquine doesn't protect cancer cells against virusses
https://www.nature.com/articles/s41586-020-2575-3
Quote "Moreover, we report that chloroquine does not block SARS-CoV-2 infection of the TMPRSS2-positive lung cell line Calu-3"
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Calu-3 is a human lung cancer cell line
https://en.wikipedia.org/wiki/Calu-3