NEGATIVE - No KRAS or NRAS mutations were detected in exons 2, 3 and 4
negative - no kras or nras mutations were detected in exons 2, 3 and 4
NEGATIVE - No KRAS or NRAS mutations were detected in exons 2, 3 and 4
negative - no kras or nras mutations were detected in exons 2, 3 and 4