1. Koide N, Yazawa K, Koike S, Adachi W, Amano J. Oesophageal cancer associated with other primary cancers: a study of 31 patients. J Gastroenterol Hepatol 1997;12:690–694.
2. Nagasawa S, Onda M, Sasajima K, Takubo K, Miyashita M. Multiple primary malignant neoplasms in patients with esophageal cancer. Dis Esophagus 2000;13:226–230.
3. Poon RT, Law SY, Chu KM, Branicki FJ, Wong J. Multiple primary cancers in esophageal squamous cell carcinoma: incidence and implications. Ann Thorac Surg 1998;65:1529–1534.
4. Shibuya H, Wakita T, Nakagawa T, Fukuda H, Yasumoto M. The relation between an esophageal cancer and associated cancers in adjacent organs. Cancer 1995;76:101–105.
5. Chuang SC, Scelo G, Tonita JM, et al. Risk of second primary cancer among patients with head and neck cancers: a pooled analysis of 13 cancer registries. Cancer Epidemiol Biomarkers Prev 2008;17:1543–1549.
6. Matsubara T, Yamada K, Nakagawa A. Risk of second primary malignancy after esophagectomy for squamous cell carcinoma of the thoracic esophagus. J Clin Oncol 2003;21:4336–4341.
7. Park EK, Kwon JH, Lee JH, Lee SJ. Clinical study of multiple primary malignant tumor. Korean J Med 2005;69:410–418.
8. Choi JY, Lee KS, Kwon OJ, et al. Improved detection of second primary cancer using integrated [18F] fluorodeoxyglucose positron emission tomography and computed tomography for initial tumor staging. J Clin Oncol 2005;23:7654–7659.
9. Ishimori T, Patel PV, Wahl RL. Detection of unexpected additional primary malignancies with PET/CT. J Nucl Med 2005;46:752–757.
10. van Westreenen HL, Westerterp M, Jager PL, et al. Synchronous primary neoplasms detected on
18F-FDG PET in staging of patients with esophageal cancer. J Nucl Med 2005;46:1321–1325.
11. Warren S. Multiple primary malignant tumors. Am J Cancer 1932;16:1358–1414.
12. Greene F, Page D, Fleming I. AJCC Cancer Staging Manual. 6th ed. New York: Springer-Verlag, 2002.
13. Ajani J, D’Amico TA, Hayman JA, Meropol NJ, Minsky B, National Comprehensive Cancer Network. Esophageal cancer: clinical practice guidelines in oncology. J Natl Compr Canc Netw 2003;1:14–27.
14. Kim JH, Choi EK, Kim SB, et al. Preoperative hyperfractionated radiotherapy with concurrent chemotherapy in resectable esophageal cancer. Int J Radiat Oncol Biol Phys 2001;50:1–12.
15. Lee JL, Park SI, Kim SB, et al. A single institutional phase III trial of preoperative chemotherapy with hyperfractionation radiotherapy plus surgery versus surgery alone for resectable esophageal squamous cell carcinoma. Ann Oncol 2004;15:947–954.
16. Kim MK, Kim SB, Ahn JH, et al. Treatment outcome and recursive partitioning analysis-based prognostic factors in patients with esophageal squamous cell carcinoma receiving preoperative chemoradiotherapy. Int J Radiat Oncol Biol Phys 2008;71:725–734.
17. Gandini S, Botteri E, Iodice S, et al. Tobacco smoking and cancer: a meta-analysis. Int J Cancer 2008;122:155–164.
18. van Westreenen HL, Westerterp M, Bossuyt PM, et al. Systematic review of the staging performance of
18F-fluorodeoxyglucose positron emission tomography in esophageal cancer. J Clin Oncol 2004;22:3805–3812.
19. Rosenbaum SJ, Stergar H, Antoch G, Veit P, Bockisch A, Kuhl H. Staging and follow-up of gastrointestinal tumors with PET/CT. Abdom Imaging 2006;31:25–35.
20. Kleinberg L, Forastiere AA. Chemoradiation in the management of esophageal cancer. J Clin Oncol 2007;25:4110–4117.
21. Kim YJ, Kim JY, Do YR, Song HS, Kim OB. The efficacy of concurrent chemoradiotherapy for patients with inoperable esophageal cancer. Korean J Med 2007;72:37–43.
22. Lee GD, Kim YH, Kim JB, et al. Esophageal cancer associated with multiple primary cancers: surgical approaches and long-term survival. Ann Surg Oncol 2013;20:4260–4266.
23. Di Fiore F, Lecleire S, Pop D, et al. Baseline nutritional status is predictive of response to treatment and survival in patients treated by definitive chemoradiotherapy for a locally advanced esophageal cancer. Am J Gastroenterol 2007;102:2557–2563.