A proposal for a TNM staging system for extramammary Paget disease: Retrospective analysis of 301 patients with invasive primary tumors

Kuniaki Ohara, Yasuhiro Fujisawa, Koji Yoshino, Yoshio Kiyohara, Takafumi Kadono, Yozo Murata, Hisashi Uhara, Naohito Hatta, Hiroshi Uchi, Shigeto Matsushita, Tatsuya Takenouchi, Toshihiko Hayashi, Kenichi Yoshimura, Manabu Fujimoto

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Abstract

Background Although extramammary Paget disease (EMPD) usually appears as carcinoma in situ, it sometimes becomes invasive (iEMPD) and fatal. However, a TNM staging system for iEMPD has yet to be established. Objective The aim of this study was to establish a TNM staging system for iEMPD. Methods We retrospectively collected iEMPD patients treated at 12 institutes in Japan. Factors reported to be associated with survival such as distant metastasis, lymph node (LN) metastasis, and primary tumor status were evaluated using the log-rank test. Results We enrolled 301 iEMPD patients, of whom 114 had remote metastases (49 had both distant and LN metastasis; 2, distant metastasis only; and 63, LN metastasis only) and the remaining 187 patients had no remote metastasis. Distant metastasis (M1) showed worse survival (P < 0.00001). In the analysis of the 250 patients without distant metastasis, LN metastasis also showed worse survival (P < 0.00001). Among the patients with LN metastasis, 2 or more LN metastases (N2) showed worse survival than did single LN metastasis (N1, P = 0.02). Lastly, in the analysis of the 187 patients without metastasis, tumor thickness of over 4 mm or lymphovascular invasion showed worse survival (T2, P < 0.05 and P < 0.001, respectively). Patients with neither of these features were defined as T1. From these results, we propose this TNM staging system: stage I, T1N0M0; stage II, T2N0M0; stage IIIa, anyTN1M0; stage IIIb, anyTN2M0; stage IV, anyTanyNM1. Other than stages II and IIIa, each stage had a statistically distinct survival curve. Conclusion We propose a TNM staging system for EMPD using simple factors for classification that could provide important prognostic information in managing EMPD. However, accumulation of more patient data and further revision of the system are required.

Original languageEnglish
Pages (from-to)234-239
Number of pages6
JournalJournal of Dermatological Science
Volume83
Issue number3
DOIs
Publication statusPublished - Sep 1 2016

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Molecular Biology
  • Dermatology

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    Ohara, K., Fujisawa, Y., Yoshino, K., Kiyohara, Y., Kadono, T., Murata, Y., Uhara, H., Hatta, N., Uchi, H., Matsushita, S., Takenouchi, T., Hayashi, T., Yoshimura, K., & Fujimoto, M. (2016). A proposal for a TNM staging system for extramammary Paget disease: Retrospective analysis of 301 patients with invasive primary tumors. Journal of Dermatological Science, 83(3), 234-239. https://doi.org/10.1016/j.jdermsci.2016.06.004