Objective To investigate the expressions of containing CKLF like MARVEL transmembrane domain gene 6(CMTM6)and ras protein activator like 2(RASAL2)in prostate cancer tissues,and to analyze the relationships between the above factors and the clinicopathological characteristics and prognosis of prostate cancer patients.Methods The prostate cancer tissues and adjacent tissues of 80 prostate cancer patients admitted to Zhumadian City Center Hospital during Feb.2018 and Feb.2020 were collected.Expressions of CMTM6 and RASAL2 were detected with immunohistochemical method.The relationship between the expressions of CMTM6 and RASAL2 and the clinical pathological characteristics of prostate cancer were analyzed.The survival curve was plotted with Kaplan-Meier method.The prognostic factors were analyzed with multivariate Cox regression.Results The positive expression rate of CMTM6 in prostate cancer tissues was 67.50％,which was obviously higher than 38.75％in adjacent tissues(x2=13.277,P＜0.001).The positive expression rate of RASAL2 in prostate cancer tissues was 47.50％,which was obviously lower than 73.75％in adjacent tissues(x2=11.546,P=0.001).The expressions of CMTM6 and RASAL2 were not related to patients'age,tumor size and tissue differentiation(P＞0.05),but to TNM staging,Gleason score,lymph node metastasis and preoperative PSA level(P＜0.05).Survival curve showed that the 3-year survival rate of positive CMTM6 expression patients was 61.11％(33/54),which was obviously lower than that of negative patients,which was 88.46％(23/26)(x2=5.940,P=0.015).The 3-year survival rate of positive RASAL2 expression patients was 81.85％(31/38),which was obviously higher than that of negative patients,which was 59.52％(25/42)(x2=4.887,P=0.027).Cox multivariate regression showed that Gleason score,lymph node metastasis,preoperative PSA level,CMTM6,and RASAL2 were independent influencing factors of prognosis(P＜0.05).Conclusion The positive expression rate of CMTM6 in prostate cancer tissues is significantly higher than that in paracancer tissues,while the positive expression rate of RASAL2 in prostate cancer tissues is significantly lower than that in paracancer tissues.Both CMTM6 and RASAL2 are closely related to the clinical pathological characteristics and prognosis of prostate cancer patients,and may provide reference for the prognosis.
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