Yes, Cassin Ridge on Denali. He did miss out on the K2 FA expedition due to some health issue, IIRC. I'm pretty sure he was on a FA expedition to one of the other 8,000M peaks, though. Maybe one of the Gasherbrums?
If you read between the lines of this quote by Cassin, it would appear that the cardiac problem was trumped up to keep him off the team. Desio (IMHO from what I have read of the expedition) appeared to be the type who did not want to be upstaged or have his leadership challenged. "In 1952, he [ Ardito Desio, the expedition leader] had taken me to the Himalaya to sketch the route, organize the expedition, and [figure out] the material to bring. Before we left for Kathmandu, he sent me to do a physical in Rome, where I was told I had some cardiac problems and had to stay home while the expedition members conquered the mountain."
Cassin led a successful expedition to Gasherbrum IV (not an 8K peak). Summiters were Walter Bonatti and Carlo Mauri, coincidentally on Aug 6 of 1958.
JohnL
The VftT thread a few months ago on Achille Compagnoni's passing got me re-interested in the K2 expedition of 1954 (ex., see book at link below), in which Walter Bonatti was ostracized by the leaders of the expedition. I think that things would have been a lot different if Ricardo Cassin had been there.
http://www.amazon.com/K2-Price-Conquest-Lino-Lacedelli/dp/1594850305