Japanese Journal of Clinical Oncology, Vol 29, Issue 11 550-555, Copyright © 1999 by Foundation for Promotion of Cancer Research
T Yamao, S Kai, A Kazami, K Koizumi, T Handa, N Takemoto and M Maruyama
BACKGROUND: To evaluate whether tumor markers can be used to assess
response to systemic chemotherapy, we analyzed preliminarily the
relationship between the response to chemotherapy based on serial imaging
and on change in serum tumor marker level of CEA, CA19-9 and CA125.
METHODS: We analyzed 26 patients with advanced gastric cancer in whom at
least one of the tumor markers CEA, CA19-9 and CA125 was elevated before
systemic chemotherapy with regard to the relationship between the change in
serum tumor marker level and response assessment by imaging studies
throughout the treatment course. A responder was defined as showing a >
or = 50% drop in tumor marker level for more than 4 weeks. RESULTS: The
sensitivity and negative predictive value of falling tumor marker level
after chemotherapy for a partial response in imaging was 100%. When
patients were categorized as responders or non-responders, a significant
correlation was observed between the assessment of response by tumor
markers and by imaging studies. The survival time of responders assessed by
tumor markers was significantly longer than that of non-responders.
CONCLUSIONS: The measurement of tumor markers might be useful in monitoring
response and in predicting the prognosis of patients with advanced gastric
cancer treated with systemic chemotherapy. Tumor markers may be used as a
means of monitoring treatment in patients when in an imaging study it is
difficult to assess response to chemotherapy in clinical practice. Further
studies are required to confirm these findings.
ORIGINAL ARTICLE
Tumor markers CEA, CA19-9 and CA125 in monitoring of response to systemic chemotherapy in patients with advanced gastric cancer
Department of Medicine, Cancer Institute Hospital, Tokyo, Japan. tyamao@jfcr.or.jp
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