1. Artac M, Bozcuk H, Ozdogan M, Demiral A, Sarpe A, Samur M, Sava B: Different clinical features of primary and secondary tumors in patients with multiple malignancies. Tumori. 2005, 91: 317-320.
2. Dong C, Hemminki K: Second primary neoplasms in 633,964 cancer patients in Sweden 1958-1996. Int J Cancer. 2001, 93: 155-161. 10.1002/ijc.1317.
3. Van Westreenen HL, Westerterp M, Jager PL, van Dullemen HM, Sloof GW, Comans EFI, van Lanschot JJB, Wiggers T, Plukker JTM: Synchronous primary neoplasms detected on 18F-FDG PET in staging of patients with esophageal cancer. J Nucl Med. 2005, 46: 1321-1325.
4. Crocetti E, Arniani S, Buiatti E: Synchronous and metachronous diagnosis of multiple primary cancers. Tumori. 1998, 84: 9-13.
5. Mehdi I, Shah AH, Moona MS, Verma K, Abussa A, Elramih R, El-Hashmi H: Synchronous and metachronous malignant tumours expect the unexpected. J Pak Med Assoc. 2010, 60: 905-