World Journal of Surgery

, Volume 28, Issue 7, pp 721–726 | Cite as

Molecular Detection of APC, K-ras, and p53 Mutations in the Serum of Colorectal Cancer Patients as Circulating Biomarkers

  • Jaw-Yuan Wang
  • Jan-Sing Hsieh
  • Mei-Yin Chang
  • Tsung-Jen Huang
  • Fang-Ming Chen
  • Tian-Lu Cheng
  • Ketil Alexandersen
  • Yu-Sheng Huang
  • Wen-Shyong Tzou
  • Shiu-Ru LinEmail author
Original Scientific Reports


Early detection of tumor DNA in serum/plasma prior to the development of recurrence or metastases could help improve the outcome of patients with colorectal cancer (CRC) after tumor resection. Recent advances in the detection of tumor DNA in the serum/plasma has opened up numerous new areas for investigation and new possibilities for molecular diagnosis. APC and K-ras mutations are considered to be early-stage developments of CRCs, whereas p53 mutations are thought to be relatively late events in the tumorigenesis of CRCs. The aim of this study was to search for the presence of genetic mutations in the DNA extracted from the serum of CRC patients and healthy subjects. We simultaneously evaluate the significance of APC, K-ras, and p53 gene mutations in cancer tissues and their paired serum samples of 104 CRC patients by polymerase chain reaction-single strand conformation polymorphism analysis (PCR-SSCP) followed by direct sequencing. Additionally, analysis was carried out to detect the serum carcinoembryonic antigen (CEA) levels in CRC patients. Overall, we found at least one of the gene mutations in tumor tissues from 75% (78/104) of the CRC patients. Comparison of the three molecular markers showed that the detection rates in the serum were 30.4%, 34.0%, and 34.2% for APC, K-ras, and p53 genes, respectively. Of these patients, 46.2% (36/78) were identified as having positive serum results, whereas all healthy controls remained negative. The overall positive tumor DNA detection rates in the serum were 0% (0/7) for Dukes’ A classification, 22.4% (11/49) for Dukes’ B, 48.7% (19/39) for Dukes’ C, and 66.7% (6/9) for Dukes’ D. The detection rate increased as the tumor stage progressed (p = 0.012). Concurrently, a significant difference was observed between lymph node metastases and positive serum tumor DNA detection (p < 0.001). A significantly higher postoperative metastasis/recurrence rate in patients harboring gene mutations with serum tumor DNA than those without serum tumor DNA was also demonstrated (p < 0.001). However, no significant correlation between the postoperative metastasis/recurrence and serum CEA levels was observed (p = 0.247). These data suggest that the identification of circulating tumor DNA using the molecular detection of APC, K-ras, and p53 gene mutations is a potential tool for early detection of postoperative recurrence/metastases. Moreover, these genes may be potential molecular markers of poor clinical outcome in CRC patients.


Circulate Tumor Cell Disseminate Tumor Cell Strand Conformation Polymorphism Analysis Heptamethine Exhibit Lymph Node Metastasis 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



This work was supported by grants from the National Science Council of the Republic of China (NSC92-2314-B-037-096).


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Copyright information

© Société Internationale de Chirurgie 2004

Authors and Affiliations

  • Jaw-Yuan Wang
    • 1
    • 2
  • Jan-Sing Hsieh
    • 2
  • Mei-Yin Chang
    • 1
  • Tsung-Jen Huang
    • 2
  • Fang-Ming Chen
    • 1
    • 2
  • Tian-Lu Cheng
    • 1
    • 3
  • Ketil Alexandersen
    • 1
  • Yu-Sheng Huang
    • 2
  • Wen-Shyong Tzou
    • 4
  • Shiu-Ru Lin
    • 1
    Email author
  1. 1.MedicoGenomic Research CenterKaohsiung Medical UniversityKaohsiungTaiwan
  2. 2.Department of SurgeryKaohsiung Medical UniversityKaohsiungTaiwan
  3. 3.School of Biomedical Science and Environmental BiologyKaohsiung Medical UniversityKaohsiungTaiwan
  4. 4.School of BiotechnologyKaohsiung Medical UniversityKaohsiungTaiwan

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