RESUMEN
BACKGROUND: Transforming growth factor-beta (TGF-ß) is associated with a higher incidence of distant metastasis and decreased survival. Whether TGF-ß can be used as a prognostic indicator of colorectal cancer (CRC) remains controversial. METHODS: The Medline, EMBASE and Cochrane databases were searched from their inception to March 2016. The studies that focused on TGF-ß as a prognostic factor in patients with CRC were included in this analysis. Overall survival (OS) and disease-free survival (DFS) were analysed separately. A meta-analysis was performed, and hazard ratios (HR) with 95% confidence intervals (CI) were calculated. RESULTS: Twelve studies were included in the analysis, of which 8 were used for OS and 7 for DFS. In all, 1622 patients with CRC undergoing surgery were included. Combined HRs suggested that high expression of TGF-ß had a favourable impact on OS (HR = 1.68, 95% CI: 1.10-2.59) and DFS (HR = 1.11, 95% CI: 1.03-1.19) in CRC patients. For OS, the combined HRs of Asian studies and Western studies were 1.50 (95% CI: 0.61-3.68) and 1.80 (95% CI: 1.33-2.45), respectively. For DFS, the combined HRs of Asian studies and Western studies were 1.42 (95% CI: 0.61-3.31) and 1.11 (95% CI: 1.03-1.20), respectively. CONCLUSIONS: This meta-analysis demonstrates that TGF-ß can be used as a prognostic biomarker for CRC patients undergoing surgery, especially for CRC patients from Western countries.
Asunto(s)
Biomarcadores de Tumor/genética , Neoplasias Colorrectales/cirugía , Pronóstico , Factor de Crecimiento Transformador beta/genética , Pueblo Asiatico , Neoplasias Colorrectales/genética , Neoplasias Colorrectales/patología , Supervivencia sin Enfermedad , Femenino , Humanos , Masculino , Modelos de Riesgos ProporcionalesRESUMEN
BACKGROUND AND PURPOSE: Nonylphenol (NP) is a well-known environmental hormone recognized as detrimental to the reproductive systems of aquatic animals and humans. The effect of NP on probiotics in the human gastrointestinal tract remains unclear. This study investigated the effect of NP on the growth of Lactobacillus acidophilus and Bifidobacterium bifidum. METHODS: L. acidophilus and B. bifidum were grown in anaerobic cultures. Both strains were incubated with and without NP. The dose effects of NP on the growth of both probiotics were compared, and the effects of NP on the growth of L. acidophilus and B. bifidum in different concentrations were evaluated. RESULTS: NP 5 to 10 microg/mL inhibited the growth of L. acidophilus (p < 0.05), but was ineffective at 2.5 microg/mL (p > 0.05). NP significantly inhibited the growth of B. bifidum in a dose-dependent manner (p < 0.05). NP inhibited the growth of different concentrations of L. acidophilus (6.25 x 10(4); to 2.5 x 10(5); colony-forming units [CFU]/mL) and B. bifidum (1.25 x 10(9); to 5.0 x 10(9); CFU/mL) [p < 0.05]. CONCLUSIONS: Growth of L. acidophilus and B. bifidum was inhibited by NP. This finding suggests that NP may interfere with normal gastrointestinal microbiota. This may alter immunomodulation in the intestinal mucosa and may be correlated with an increase in the incidence of allergic diseases or other gastrointestinal disorders.