Fig. 4

Survival curves of patients with metastatic colorectal cancer stratified by tumor sidedness and history of smoking. a-b, survival curves of cohort M stratified by history of smoking (a) or by tumor sidedness (b); c-d, survival curves of never smokers (c) or ever-smokers (d) stratified by tumor sidedness; e, comparisons of overall survival regarding tumor sidedness and history of smoking; f, survival curves of patients with metastatic LSCRC treated with cetuximab stratified by history of smoking. mCRC metastatic colorectal cancer, RSCC right-sided colon cancer, LSCRC left-sided colorectal cancer. ***stands for < .001; ns stands for not significant. CRC colorectal cancer