Murcidencel has been studied in three trials and only one had an ECA. But if you want to know about ECA approvals:
45 have been approved on an ECA —that is significant going back 20 yrs in history—only about 40 drugs are approved each year roughly if I recall correctly.
In terms of cancer drugs specifically that were approved on ECAs: Erdafitinib, Selumetinib, Blinatumomab, Keytruda+lenvatinib combo, and several combos for renal cancer … and others that I am sure I have forgotten.
I recommend researching ECA approvals further for yourself. Include RAs abroad and the evolving stance of the FDA toward RWE in your search.