Epidermal Growth Factor Receptor Expression Discrepancies in Metastatic Colorectal Cancer Patients Treated with Cetuximab Plus Irinotecan-Based Chemotherapy Refractory to Irinotecan and Oxaliplatin

2009 ◽  
Vol 52 (6) ◽  
pp. 1144-1151 ◽  
Author(s):  
Hye-Suk Han ◽  
Hee Jin Chang ◽  
Yong Sang Hong ◽  
Sun Young Kim ◽  
Keun Seok Lee ◽  
...  
Keyword(s):  
Colorectal Cancer ◽  
Epidermal Growth Factor Receptor ◽  
Growth Factor ◽  
Epidermal Growth Factor ◽  
Metastatic Colorectal Cancer ◽  
Cancer Patients ◽  
Growth Factor Receptor ◽  
Receptor Expression ◽  
Epidermal Growth ◽  
Colorectal Cancer Patients

Cetuximab Shows Activity in Colorectal Cancer Patients With Tumors That Do Not Express the Epidermal Growth Factor Receptor by Immunohistochemistry

2005 ◽  
Vol 23 (9) ◽  
pp. 1803-1810 ◽  
Author(s):  
Ki Young Chung ◽  
Jinru Shia ◽  
Nancy E. Kemeny ◽  
Manish Shah ◽  
Gary K. Schwartz ◽  
...  
Keyword(s):  
Colorectal Cancer ◽  
Epidermal Growth Factor Receptor ◽  
Growth Factor ◽  
Epidermal Growth Factor ◽  
Cancer Patients ◽  
Growth Factor Receptor ◽  
Pathology Report ◽  
Egfr Expression ◽  
Epidermal Growth ◽  
Colorectal Cancer Patients

Purpose To establish evidence of activity, or lack thereof, of cetuximab-based therapy in patients with refractory colorectal cancer with tumors that do not demonstrate epidermal growth factor receptor (EGFR) expression by immunohistochemistry (IHC). Patients and Methods Pharmacy computer records were reviewed to identify all patients who received cetuximab at Memorial Sloan-Kettering Cancer Center in a nonstudy setting during the first 3 months of cetuximab's commercial availability. Medical records of these patients were then reviewed to identify colorectal cancer patients who had experienced failure with a prior irinotecan-based regimen and who had a pathology report indicating an EGFR-negative tumor by IHC. Pathology slides from these patients were reviewed by a reference pathologist to confirm EGFR negativity, and computed tomography scans during cetuximab-based therapy were reviewed by a reference radiologist. Response rates were reported using WHO criteria. Results Sixteen chemotherapy-refractory, EGFR-negative colorectal cancer patients who received cetuximab in a nonstudy setting were identified. Fourteen of these patients received cetuximab plus irinotecan, and two received cetuximab monotherapy. In the 16 patients, four major objective responses were seen (response rate, 25%; 95% CI, 4% to 46%). Conclusion Colorectal cancer patients with EGFR-negative tumors have the potential to respond to cetuximab-based therapies. EGFR analysis by current IHC techniques does not seem to have predictive value, and selection or exclusion of patients for cetuximab therapy on the basis of currently available EGFR IHC does not seem warranted.

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