Abstract
To predict the efficacy of platinum-containing chemotherapy, ERCC1 expression levels were investigated. Studies have shown changes in the performance of anti-ERCC1 antibodies; therefore, predicting chemotherapy efficacy by immunohistochemical assessment of ERCC1 is controversial. Twenty-eight patients who received platinum-containing chemotherapy and underwent computed tomography evaluation 6-9 weeks after therapy initiation were retrospectively identified. The tumor samples were evaluated in 2012 and 2018 using the latest anti-ERCC1 antibodies available at those times. In 2012, the ERCC1 H-score was significantly higher in patients with disease progression than in patients without disease progression (p=0.019). Although the same trend was shown in 2018, there were some inconsistent results between the 2012 and 2018 samples. Patients with tumors showing low ERCC1 expression had a better disease control rate on platinum-containing chemotherapy. However, since the performance of the antibody changed over time, standardized technology to evaluate ERCC1 expression is needed.
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