Background: MCTs, short for monocarboxylate transporters, especially MCT1 and MCT4, have been widely touched upon in a variety of immune and cancer cells; however, they have been rarely described in esophageal squamous cell carcinoma (ESCC). IL7R, receptor of interleukin 7, has been shown to operate in several cancers; though, the clinicopathological implication of IL7R expression in ESCC remains less known.Methods: Herein, to understand the clinicopathological involvements of MCT1, MCT4 and IL7R in ESCC, immunohistochemistry was performed with ESCC tissue microarray comprising 86 paired ESCC and its matched normal control dots. Post-hoc statistical analyses were undertaken with Cross-table and survival analyses. Results: It was shown that concomitant expression of MCT1, MCT4 and IL7R prevailed in the stromal compartment of ESCC tissues relative to the epithelial. Moreover, upregulated MCT1 and MCT4 were markedly associated with tumor size; while IL7R was displayed to closely correlate with lymph node metastases and clinical stage. Elevated MCT1, MCT4 and IL7R were strikingly associated with adverse outcome of ESCC.Conclusions: Together, the data we presented here indicate that MCT1/4 and IL7R were heavily involved in the oncogenesis of ESCC.
BackgroundMonocarboxylic acid, including lactate, pyruvate and ketone bodies, have been found to play major roles in cancer metabolism and must be transported across both the plasma and mitochondrial membranes [1], where monocarboxylate transporter (abbreviated as MCT) family actually take charge of the process. MCT family now comprises as many as 14 members, of which only the first four, that is, from MCT1 to MCT4, have been experimentally borne out to catalyze the transport of monocarboxylates, such as lactate, pyruvate and ketone bodies [1,2], which come to be recognized as important metabolic fuel for cancer cells. Given this, there is a need to understand the clinicopathological as well as prognostic implication of MCT1 and MCT4 expression in ESCC, where it has been little described surrounding MCT1 and MCT4 expression and its significance.Lactate, as mentioned above, has been shown to be as an important metabolic fuel for normal cells in