I think this poster at AACR may have flown under the radar, but Tempus has a great dataset for (mostly) unbiased estimation of prevalence of rare fusion driven cancers and for NUT carcinoma they found that ~2/3 of cases are misdiagnosed:

https://aacrjournals.org/cancerres/article/85/8_Supplement_1/3389/757648

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