Ethics statement
Local ethical guidelines were followed for the use of archival tissues for research with ethical approval (05‐Q1604‐10)
Authors’ contributions
Experimental design, data collection and analysis: MMT, AC, ZC, FC, MQD. Case contribution and pathology: SD, AW. Manuscript writing and preparation: MQD with input from all coauthors. All authors commented and edited on the manuscript and approve its submission for publication.
Disclosure statement
The authors report no competing interests to declare.