alternatehistory.com

There's a few decent threads on WI Fredrick III of Germany had survived his bout of cancer, but I'd like to take a look here to ask the how.

Specifically: What is the latest PoD necessary for Fredrick III to have another 20 years of rule (compared to OTL)? Does he have to give up smoking earlier, or can an operation in 1887 repair his throat and body enough? Or is there something else I'm missing?
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