preferred_name: KRAS Exon 2 Mutation Negative
preferred_name_lc: kras exon 2 mutation negative
label: v-Ki-ras2 Kirsten Rat Sarcoma Viral Oncogene Homolog Exon 2 Mutation Negative
label_lc: v-ki-ras2 kirsten rat sarcoma viral oncogene homolog exon 2 mutation negative