Polaris

Intuitive Surgical: What Are the Limits of Robotic Surgery?

25 Hydroxy

Even if you are correct and supplements of Vit D can prevent prostate cancer- which is still unproven to my satisfaction- though I do my best to get adequate exposure to UV and eat full fat butter - it will take some years to persuade the population to follow this advice. And we are talking here of a minority of the population who are at risk of Vit D deficiency.

Furthermore will administration of Vit D in later life reverse 50 or 60 years of deficiency. Yet to be proven. So there will still be a large number of the population in the 50 to 60 age group -the key age group for prostate surgery- for whom this advice is far too late.

In the long run you may be quite right and Vit D may be very effective in preventing prostate cancer. But that will be in the long term. ISRG will have been very successful in treating those many hundreds of thousands of patients now in their forties and fifties for whom Vit D therapy will not be an option.

You may be right that in the long term there will be threats to ISRG that we have not yet foreseen - Black Swans. But that is the long term and as J M Keynes once said - "In the long run we are all dead" - including ISRG