Pleomorphic carcinoma of the lung expressing podoplanin and calretinin
Article first published online: 11 NOV 2008
© 2008 The Authors. Journal compilation © 2008 Japanese Society of Pathology
Volume 58, Issue 12, pages 771–774, December 2008
How to Cite
Kenmotsu, H., Ishii, G., Nagai, K., Nakao, M., Kawase, A., Kojika, M., Murata, Y., Nishiwaki, Y. and Ochiai, A. (2008), Pleomorphic carcinoma of the lung expressing podoplanin and calretinin. Pathology International, 58: 771–774. doi: 10.1111/j.1440-1827.2008.02309.x
- Issue published online: 11 NOV 2008
- Article first published online: 11 NOV 2008
- Received 2 May 2008. Accepted for publication 22 July 2008.
- differential diagnosis;
- malignant mesothelioma;
- pleomorphic carcinoma of the lung;
- sarcomatoid component
Pleomorphic carcinoma (PC) of the lung is classified as a subtype of sarcomatoid carcinoma of the lung, and peripheral PC is sometimes difficult to differentiate from the sarcomatoid component of mesothelioma. An 80-year-old man was referred to National Cancer Center Hospital East because a chest X-ray showed an abnormal shadow. CT scans of the chest indicated two solid masses located in the right lower lobe, and CT-guided needle biopsy yielded spindle-shaped tumor cells that were immunoreactive for both podoplanin and calretinin. Mesothelioma could not be ruled out, and the tumors were surgically resected to facilitate definitive pathological diagnosis. Both tumors were composed of undifferentiated carcinoma, bronchioloalveolar carcinoma and spindle cell carcinoma, and spindle cell component was immunoreactive for podoplanin and calretinin. Ten other tumors diagnosed as peripheral PC were also tested for podoplanin and calretinin expression. The sarcomatoid component in four of the 11 cases (36%) was immunoreactive with podoplanin, and it was calretinin positive in nine of the 11 cases (82%). When making the differential diagnosis between PC and the sarcomatoid component of mesothelioma, care is required in diagnosing biopsy specimens of peripheral lung spindle-cell tumors that are positive for both podoplanin and calretinin.