KRAS mutations testing in colorectal carcinoma patients in Italy: from guidelines to external quality assessment.
BACKGROUND
Monoclonal antibodies directed against the epidermal growth factor receptor (EGFR) have been approved for the treatment of patients with metastatic colorectal carcinoma (mCRC) that do not carry KRAS mutations. Therefore, KRAS testing has become mandatory to chose the most appropriate therapy for these patients.


RESULTS
In order to guarantee the possibility for mCRC patients to receive an high quality KRAS testing in every Italian region, the Italian Association of Medical Oncology (AIOM) and the Italian Society of Pathology and Cytopathology -Italian division of the International Academy of Pathology (SIAPEC-IAP) started a program to improve KRAS testing. AIOM and SIAPEC identified a large panel of Italian medical oncologists, pathologists and molecular biologists that outlined guidelines for KRAS testing in mCRC patients. These guidelines include specific information on the target patient population, the biological material for molecular analysis, the extraction of DNA, and the methods for the mutational analysis that are summarized in this paper. Following the publication of the guidelines, the scientific societies started an external quality assessment scheme for KRAS testing. Five CRC specimens with known KRAS mutation status were sent to the 59 centers that participated to the program. The samples were validated by three referral laboratories. The participating laboratories were allowed to use their own preferred method for DNA extraction and mutational analysis and were asked to report the results within 4 weeks. The limit to pass the quality assessment was set at 100% of true responses. In the first round, only two centers did not pass (3%). The two centers were offered to participate to a second round and both centers failed again to pass.


CONCLUSIONS
The results of this first Italian quality assessment for KRAS testing suggest that KRAS mutational analysis is performed with good quality in the majority of Italian centers.
Cell Biology and Biotherapy Unit, INT Fondazione G. Pascale, Naples, Italy. nicnorm@yahoo.com
Nicola
N
Normanno
Carmine
C
Pinto
Francesca
F
Castiglione
Alberto
A
Bardelli
Marcello
M
Gambacorta
Gerardo
G
Botti
Oscar
O
Nappi
Salvatore
S
Siena
Fortunato
F
Ciardiello
Gianluigi
G
Taddei
Antonio
A
Marchetti
D015179:Colorectal Neoplasms / Q000235:genetics*; D011905:Genes, ras; D005820:Genetic Testing / Q000379:methods*; D006801:Humans; D007558:Italy; D009154:Mutation; D016133:Polymerase Chain Reaction; D017410:Practice Guidelines as Topic; D011786:Quality Control