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That's a single in vitro study which represents Lidocaine's well-studied effects on certain kinds of cancers.

Locally-delivered lidocaine to SCC-diseased oral areas and tumorous lymph nodes is totally feasible.

Feasible, maybe. But has it ever been done before? Are you aware of any papers where lidocaine is used as a treatment for solid tumors, and not simply as an analgesic during or following surgery? Studies in humans would be most relevant, but I'd even be interested in rodent studies if lidocaine is used systemically. (i.e. given orally or injected IP/SC/IV. Having researchers inject lidocaine directly into mouse tumors is not terribly relevant to what you were recommending.)

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