Abstract:

Objective：To clarify the relationship between epidermal growth factor receptor (EGFR) mutations and the clinicopathologic features of primary lung adenocarcinomas in Xinjiang. Methods: The mutations of EGFR gene at exons 18-21 in 59 cases (including 15 cases of Uighur and 44 cases of Han) of lung adenocarcinoma tissues, which were obtained from surgical resection, were detected by amplification refractory mutation system (ARMS) method. And the relationships among mutations, race and clinicopathologic features were analyzed.Results: The frequencies of EGFR mutations in lung adenocarcinoma were 20% for Uighur, which was lower than that in Han (54.5%), P<0.05. The deletion mutations at exon 19 were seen in 2 of 15 Uighur cases and 9 of 44 Han cases. EGFR mutations were present, including exon 21 L858R in one Uighur case and 12 Han cases, exon 18 G719X in two of 44 cases of Han, exon 21 L861Q in one of them. On histological type, the frequencies of EGFR mutation in alveolar predominant adenocarcinoma was 71% (22/31), which was higher than both that in solid predominant and mucinous carcinoma ( 6.7%, 20% respectively). According to statistic analysis, EGFR mutations were without correlation with the patient’s gender, age, location, gross type, smoking status and lymph node metastasis（P>0.05）. EGFR mutation was more frequent in well-differentiated cancer, mainly in acinar carcinoma, while poorly differentiated adenocarcinoma and mucous adenocarcinoma were lower. Conclusion: There was a difference of EGFR mutation in primary lung adenocarcinoma between Uighur and Han in Xinjiang, perhaps reflecting ethnic genetic variation, which is worth further analyzing. EGFR mutation was commonly detected in well or middle differentiated adenocarcinoma, mainly in acinar carcinoma.

Key words: Adenocarcinoma of lung, Receptor, epidermal growth factor, Mutation, Polymerase chain reaction