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Cetuximab retreatment in patients with metastatic colorectal cancer who exhibited a clinical benefit in response to prior cetuximab: A retrospective study

  • Authors:
    • Hiroaki Tanioka
    • Motoi Asano
    • Ryousuke Yoshida
    • Naohisa Waki
    • Futoshi Uno
    • Masahiro Ishizaki
    • Kazuki Yamashita
    • Yuki Morishita
    • Takeshi Nagasaka
  • View Affiliations / Copyright

    Affiliations: Department of Medical Oncology, Okayama Rosai Hospital, Okayama 702‑8055, Japan, Department of Surgery, Okayama Rosai Hospital, Okayama 702‑8055, Japan, Department of Pharmacy, Okayama Rosai Hospital, Okayama 702‑8055, Japan, Department of Clinical Oncology, Kawasaki Medical School Hospital, Okayama 701‑0192, Japan
    Copyright: © Tanioka et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Pages: 3674-3680
    |
    Published online on: July 11, 2018
       https://doi.org/10.3892/ol.2018.9127
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Abstract

Clinical benefits of cetuximab retreatment in patients with metastatic colorectal (mCRC) have been reported. In the present study, the effect of cetuximab retreatment on predictive markers was investigated by evaluating the clinical benefit of initial cetuximab treatment prior to cetuximab retreatment. Between November 2012 and March 2017, 14 patients with KRAS proto‑oncogene GTPase exon 2 wild‑type mCRC who exhibited a clinical benefit (confirmed stable disease for at least 6 months or a clinical response) to an initial cetuximab‑based regimen, who received multiple lines of chemotherapy following disease progression and ultimately received a second cetuximab and irinotecan regimen, were retrospectively analyzed. For retreatment, patients received bi‑weekly irinotecan (120‑150 mg/m2) combined with cetuximab (400 mg/m2 as an initial dose, followed by 250 mg/m2, weekly). The median age of the 14 patients (11 males, 3 females) was 68 years (32‑77). The median progression‑free survival (PFS) following prior cetuximab‑based therapy was 6.6 months (range, 4.1‑18.4). Initial cetuximab treatment was administered as a first‑line treatment in 11 patients, a second‑line treatment in 1 patient and a third‑line treatment in 2 patients. The median interval time between the last cycle of initial cetuximab‑based therapy and the first cycle of cetuximab retreatment was 13.1 months (range, 6.0‑37.1). The objective response rate of cetuximab retreatment was 21.4% and the median PFS was 4.4 months (95% confidence interval, 1.4‑5.6). The Spearman's correlation coefficient for the PFS following retreatment and duration of initial cetuximab‑based regimens demonstrated a more marked correlation compared with that between the PFS following retreatment and the interval time between the two regimens (r=0.45, P=0.11 vs. r=0.08, P=0.79). Cetuximab retreatment may provide clinical benefit to patients with mCRC who were good responders with longer periods of initial cetuximab‑based therapy.
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Copy and paste a formatted citation
Spandidos Publications style
Tanioka H, Asano M, Yoshida R, Waki N, Uno F, Ishizaki M, Yamashita K, Morishita Y and Nagasaka T: Cetuximab retreatment in patients with metastatic colorectal cancer who exhibited a clinical benefit in response to prior cetuximab: A retrospective study. Oncol Lett 16: 3674-3680, 2018.
APA
Tanioka, H., Asano, M., Yoshida, R., Waki, N., Uno, F., Ishizaki, M. ... Nagasaka, T. (2018). Cetuximab retreatment in patients with metastatic colorectal cancer who exhibited a clinical benefit in response to prior cetuximab: A retrospective study. Oncology Letters, 16, 3674-3680. https://doi.org/10.3892/ol.2018.9127
MLA
Tanioka, H., Asano, M., Yoshida, R., Waki, N., Uno, F., Ishizaki, M., Yamashita, K., Morishita, Y., Nagasaka, T."Cetuximab retreatment in patients with metastatic colorectal cancer who exhibited a clinical benefit in response to prior cetuximab: A retrospective study". Oncology Letters 16.3 (2018): 3674-3680.
Chicago
Tanioka, H., Asano, M., Yoshida, R., Waki, N., Uno, F., Ishizaki, M., Yamashita, K., Morishita, Y., Nagasaka, T."Cetuximab retreatment in patients with metastatic colorectal cancer who exhibited a clinical benefit in response to prior cetuximab: A retrospective study". Oncology Letters 16, no. 3 (2018): 3674-3680. https://doi.org/10.3892/ol.2018.9127
Copy and paste a formatted citation
x
Spandidos Publications style
Tanioka H, Asano M, Yoshida R, Waki N, Uno F, Ishizaki M, Yamashita K, Morishita Y and Nagasaka T: Cetuximab retreatment in patients with metastatic colorectal cancer who exhibited a clinical benefit in response to prior cetuximab: A retrospective study. Oncol Lett 16: 3674-3680, 2018.
APA
Tanioka, H., Asano, M., Yoshida, R., Waki, N., Uno, F., Ishizaki, M. ... Nagasaka, T. (2018). Cetuximab retreatment in patients with metastatic colorectal cancer who exhibited a clinical benefit in response to prior cetuximab: A retrospective study. Oncology Letters, 16, 3674-3680. https://doi.org/10.3892/ol.2018.9127
MLA
Tanioka, H., Asano, M., Yoshida, R., Waki, N., Uno, F., Ishizaki, M., Yamashita, K., Morishita, Y., Nagasaka, T."Cetuximab retreatment in patients with metastatic colorectal cancer who exhibited a clinical benefit in response to prior cetuximab: A retrospective study". Oncology Letters 16.3 (2018): 3674-3680.
Chicago
Tanioka, H., Asano, M., Yoshida, R., Waki, N., Uno, F., Ishizaki, M., Yamashita, K., Morishita, Y., Nagasaka, T."Cetuximab retreatment in patients with metastatic colorectal cancer who exhibited a clinical benefit in response to prior cetuximab: A retrospective study". Oncology Letters 16, no. 3 (2018): 3674-3680. https://doi.org/10.3892/ol.2018.9127
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