ABSTRACT
<p><b>OBJECTIVE</b>To investigate the expression of manganese superoxide dismutase (MnSOD) and to determine the relationship between MnSOD expression and clinicopathological features, biological behaviors in esophageal carcinoma.</p><p><b>METHODS</b>Immunohistochemistry (SP) and RT-PCR were respectively used to detect the expression of MnSOD in 45 specimens of esophageal carcinoma tissues and normal esophageal mucosa (5 cm distant from the margin of cancer).</p><p><b>RESULTS</b>The positive rate of MnSOD protein expression was 31.1% in esophageal carcinoma tissues, significantly lower than 86.7% in the normal tissues (P < 0.05). The expressions of MnSOD mRNA and protein were significantly correlated with the lesion length, depths of invasion and histological grade (P < 0.05), but not with lymph node metastasis, lesion site and gross type of the tumor (P > 0.05). The relative content of MnSOD mRNA was (0.310 ± 0.036) and (0.482 ± 0.053) in the cancer and normal tissues, respectively, with a significant difference between the two groups (P < 0.05). The relative content of MnSOD mRNA was significantly related to lesion length, depths of invasion and histological grade (P < 0.05), but not correlated with lymph node status, lesion site and gross type of the tumor (P > 0.05).</p><p><b>CONCLUSION</b>The expression of MnSOD protein and mRNA is decreased in esophageal carcinoma, suggesting that MnSOD gene may be closely associated with the carcinogenesis and the degree of malignancy. Detection of MnSOD expression may be useful in diagnosis, treatment and prognosis of esophageal carcinoma.</p>
Subject(s)
Adult , Aged , Female , Humans , Male , Middle Aged , Carcinoma, Squamous Cell , Pathology , Esophageal Neoplasms , Pathology , Immunohistochemistry , Lymphatic Metastasis , Neoplasm Invasiveness , RNA, Messenger , Metabolism , Reverse Transcriptase Polymerase Chain Reaction , Superoxide Dismutase , Genetics , MetabolismABSTRACT
<p><b>OBJECTIVE</b>To investigate the association of single nucleotide polymorphism (SNP) of manganese superoxide dismutase (MnSOD) gene with carcinogenesis and progression of esophageal squamous cell carcinoma.</p><p><b>METHODS</b>The MnSOD9 T-->C SNP was genotyped by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) analysis in 103 patients with esophageal squamous cell carcinoma and 195 healthy controls.</p><p><b>RESULTS</b>A significant difference was observed in the MnSOD allelotype distribution among esophageal squamous cell carcinomas and healthy controls (chi(2) = 4.645, P < 0.05). Individuals with the 9 C allele had a significantly higher risk to develop esophageal squamous cell carcinoma compared with those with the TT allele. The frequency of C allelotype among patients with lesions of different lengths (</= 5 cm and > 5 cm) was 16.3% and 36.7%, respectively. A significant difference was observed in the MnSOD allelotype distribution between patients with lesions of different lengths (chi(2) = 5.147, P < 0.05). No significant association of the MnSOD polymorphism at 9 T-->C with the tumor site, maximal length and clinical staging was found in esophageal squamous cell carcinoma.</p><p><b>CONCLUSION</b>Single nucleotide polymorphism (SNP) of MnSOD gene may be correlated with the susceptibility and disease progression of esophageal squamous cell carcinoma, and may become a tumor marker for prediction of this cancer.</p>
Subject(s)
Aged , Female , Humans , Male , Middle Aged , Carcinoma, Squamous Cell , Genetics , Pathology , Case-Control Studies , Esophageal Neoplasms , Genetics , Pathology , Gene Frequency , Genetic Predisposition to Disease , Genotype , Neoplasm Staging , Polymerase Chain Reaction , Polymorphism, Restriction Fragment Length , Polymorphism, Single Nucleotide , Superoxide Dismutase , Genetics , Tumor BurdenABSTRACT
Objective To define the maximum-tolerated dnse(MTD)and observe the side effect of escalating cisplatin with 5-fluorouracil in concurrent chemoradiotherapy for esophageal carcinoma in Chinese,with toxicity studied.Methods Previously untreated fifteen Chinese patients suffering from esophageal carcinoma received conventional fractionafiun radiotherapy,with 5 daily fractions of 2.0 Gy per week.The total radiation dose was 60 Gy.Concurrent chemotherapy dose escalation was given by the relatively safe and kidney-sparing modified Fibonacci sequence.The starting dose was cisplatin 37.5 mg/m~2 D1 and 5-fluorouracil 500 mg/m~2 D1-5, respectively.This regimen was repeated 4 times every 28 days.Escalation dose was eisplatin 7.5mg/m~2 and 5- fluorouracil 100mg/m~2.Every cohort contained at least 3 patients.If no dose-limiting toxicity(DLT)was observed, the next dose level was opened for entry.These courses were repeated until DLT appeared.MTD was declared as one dose level below which DLT appeared.Results DLT was defined as grade 3 radiation-induced esophngitis at the level of cisplatin 60 mg/m~2,5-fluorouracil 700 mg/m~2.MTD was defined as eisplafin 52.5 mg,/m~,5- fluorouracil 700 mg/m~2.The major side effect were radiation-induced esophagitis,leucopenia,nausea,vomiting and anorexia.Conclusion Maximun tolerated dose of cisplatin with 5-fluorouracil in concurrent chemoradiotherapy in the Chinese people with esophageal carcinoma were eisplatin 52.5 mg/m~2 D1,5-fluorouracil 700 mg/m~2 D1-5,repeated 4 times every 28 days.