title: Heterogeneity of adenosine triphosphate-based chemotherapy response assay in colorectal cancer--secondary publication.
abstract: OBJECTIVE
  Adenosine triphosphate-based chemotherapy response assay (ATP-CRA) is a well-documented and validated technology that can individualize chemotherapy for patients with lung, stomach, or breast cancer. This study explored the feasibility of ATP-CRA as a chemosensitivity test in patients with colorectal cancer.
  
  
  METHODS
  A total of 118 patients who underwent surgical resection for colorectal adenocarcinoma were analyzed for chemosensitivity to 6 anticancer drugs using ATP-CRA. We calculated the cell death rate (CDR) by measuring intracellular ATP levels of drug-exposed cells and untreated controls.
  
  
  RESULTS
  Interpretable results were available for 85.5% (118/138) of patients. The mean coefficient of variation for triplicate ATP measurements was 9.2%. The highest CDR was observed in irinotecan (34.0%) and the lowest CDR in etoposide (21.0%). Paclitaxel had the broadest range of CDR (0-86.7%) and 5-FU had the narrowest range of CDR (0-56.8%). The overall highest responsiveness was seen most prevalently in irinotecan (24.7%, 23/93 patients). Irinotecan had the greatest responsiveness in patients with well differentiated and moderately differentiated carcinoma.
  
  
  CONCLUSIONS
  Our study suggests that ATP-CRA could be used to identify patients with colorectal cancer who might benefit from treatment with a specific chemotherapeutic agent.
authors.affiliation: Department of Surgery, Chonnam National University Hwasun Hospital and Medical School, Gwangju, Korea.
authors.forename: Jung Wook
authors.initials: JW
authors.lastname: Huh
authors.forename: Yoon Ah
authors.initials: YA
authors.lastname: Park
authors.forename: Kang Young
authors.initials: KY
authors.lastname: Lee
authors.forename: Seung-Kook
authors.initials: SK
authors.lastname: Sohn
mesh_terms: D000230:Adenocarcinoma / Q000188:drug therapy*; D000255:Adenosine Triphosphate / Q000378:metabolism*; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000970:Antineoplastic Agents / Q000494:pharmacology* / Q000627:therapeutic use; D015179:Colorectal Neoplasms / Q000188:drug therapy*; D004354:Drug Screening Assays, Antitumor / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D057285:Precision Medicine; D014407:Tumor Cells, Cultured
chemical_list: D000970:Antineoplastic Agents; D000255:Adenosine Triphosphate