With regard to the original article “A case of primary lung adenocarcinoma mimicking metastatic papillary thyroid carcinoma”

[...]these tumors may be recognized as primary lung adenocarcinomas that mimic metastatic PTC. Immunophenotype conversion occurs in metastatic breast cancer 5 and is believed to result from the clonal selection of less differentiated receptor-negative cells following hormonal treatment. Conceptualization, Y.H. and T.T.; Methodology, Y.H.; Investigation, Y.H.; Formal analysis, Y.H.; Resources, Y.Y. and K.S.; Writing – original draft, Y.H.; Writing – review and editing, T.T.; Visualization, T.T.; Supervision, T.T.; Funding acquisition, T.T.; Data curation, Y.H. ACKNOWLEDGMENTS This study was partially supported by the Japan Society for the Promotion of Science KAKENHI (grant no. 23K06423).