Abstract:

Abstract:Objective To study the expression of tumor stem cell marker aldehyde dehydrogenase  1(ALDH 1) in invasive bladder cancer tissue and to clarify its relationship with the biological behavior of bladder cancer.Methods The ALDH1 expression in 109 cases of primary invasive carcinomas specimens (case group) and 20 cases of  normal bladder tissue surrounding cancer (control group) was detected by immunohistochemistry.At the same time,the ALDH1 expression in 6 cases of metastatic pelvic lymph node  tissue and  20 cases of non-metastatic pelvic lymph node tissue was detected.The relationship between the ALDH1 expression and the chinicopathological charateristics of invasive bladder cancer and its influence in the survival rate and disease-free survival were analyzed.Results The positive rates of ALDH1 expression in bladder cancer tissue and normal bladder tissue were 33.94%（37/109）and 5.00%（1/20），respectively, there was significant different between them（P<0.01）;they were 19.05%(8/42)and 43.28%(29/67) in the cases with non muscle invasive and nmuscle invasive bladder cancer, respectively,there was significant difference(P<0.01）;they were 13.04%(3/23) and 39.53%(34/86) in the cases of bladder cancer with low grade and high grade,  respectively,there was significant difference（P<0.05）;they were 50.00%(3/6) and 12.90%(4/31) in the tissue of bladder cancer with metastatic lymph nodes and non metastatic ones, respectively,there was significant difference（P<0.05）;they were 50.00%(3/6)and 0.00%(0/20)in the metastatic lymph nodes and non metastatic ones, respectively,there was significant difference（P<0.01）.The overall survival rate in the patients  with positive ALDH1 expression was 64.9% while it was 84.7% in negative ones,there was significant difference（P<0.05）;the disease-free Survival was 51.4% and 75% in the patients with positive and negative ALDH1 groups, respectively, there was significant difference（P<0.05）.
Conclusion The high expression of tumor stem cell marker ALDH1 is associated with staging，grading and prognosis of invasive bladder cancer.ALDH1 may play a role in the tumorigenesis,progression and metastasis of bladder cancer.

Key words: aldehyde dehydrogenase 1, tumor stem cell, invasive bladder cancer,
immunohistochemistry