The present study aimed to explore the long non‑coding RNA (lncRNA) expression profiles and correlation of lnc‑PKD2‑2‑3 with tumor features and prognosis, and to investigate its effect on regulating cancer‑cell stemness and its potential as a cancer stem cell (CSC) marker in cholangiocarcinoma (CCA). lncRNA expression profiles were determined in 3 pairs of CCA tumors and adjacent tissues by microarray analysis, and lnc‑PKD2‑2‑3 expression was then validated in 60 paired samples by reverse transcription‑quantitative polymerase chain reaction (RT‑qPCR).
PKD2 participation to uncontrolled growth, survival, neovascularization, metastasis, and invasion has been documented in various tumor types including pancreatic, colorectal, gastric, hepatic, lung, prostate, and breast cancer, as well as glioma multiforme and leukemia.
Sequence analysis of the coding regions of PKD1 and PKD2 employing DNA from both peripheral leukocytes and the tumor revealed the most common PKD1 mutation, 5014_5015delAG.
Considering previous reports that TM-1 acts as a suppressor of neoplastic growth of transformed cells, it is possible that TM-1 contributes to cyst formation/growth when the anchorage of PC2 to the actin microfilament via TM-1 is altered.