RESUMEN
BACKGROUND: The Glutathione S-transferases (GSTs) genes deletion polymorphisms have been associated with the progression of several cancers. The association studies between the 2 GSTs (GSTM1 and GSTT1) null polymorphisms with the susceptibility to renal cell carcinoma (RCC) have been inconclusive. Therefore, with the inclusion of our own data, we performed a comprehensive meta-analysis to assess the association between these 2 polymorphisms and the risk of RCC. METHODS: A systematic literature search was carried out for studies published in the PubMed, EMBASE, Cochrane library, and Google Scholar from 1997 to December 2014. Results were stated as pooled odds ratios (ORs) for nonparametric data after heterogeneity analysis with 95% CI using fixed effect or random effect model. RESULTS: We systematically selected 13 relevant studies after thorough searches from the databases. Data showed no association between the GSTM1 and the GSTT1 null genotypes and the risk of RCC (OR = 1.01; CI: 0.92-1.11; P = 0.89 for GSTM1 and OR = 1.14; CI: 0.91-1.42; P = 0.25 for GSTT1). No association was found when the data were stratified according to the geographical/ethnic basis, source of control, and the risk factor evaluation. Subgroup analysis of occupational exposure to pesticides showed an inverse association of the active genotypes of both GSTM1 and GSTT1 polymorphisms with the exposed group of RCC (P<0.00001 and P<0.00001, respectively). The combined null genotype of the GSTM1/GSTT1 significantly increased the susceptibility to RCC by 1.4-fold (P = 0.001). This association remained significant for the Asian populations in subgroup analysis (OR = 1.8; CI: 1.30-2.49; P = 0.0004). CONCLUSION: In conclusion, this meta-analysis suggests that the 2 GSTs deletion polymorphisms independently have no association with the risk of RCC. However, combination of both deletions increases the risk of developing the RCC.
Asunto(s)
Carcinoma de Células Renales/genética , Glutatión Transferasa/genética , Neoplasias Renales/genética , Estudios de Casos y Controles , Predisposición Genética a la Enfermedad , Humanos , Polimorfismo Genético , PronósticoRESUMEN
BACKGROUND: Gallbladder cancer (GBC) is a common malignancy in our country; however, very limited data exist on this malignancy in Pakistan. METHODS: This is a retrospective analysis of all the admitted patients diagnosed with GBC or cholangiocarcinoma in between 1st January 1995 to 31st December 2007. RESULTS: A total of 245 patients were admitted with diagnosis of GBC or cholangiocarcinoma. Sixty seven percent were females. Right hypochondrial pain (70.6%) and jaundice (49.8%) were the commonest symptoms, followed by nausea and vomiting (11.8%), weight loss (13%), fever (18.8%), anorexia (9.8%) and ascites (3.3%). Gallstones were seen in 132 (53.9%) patients. Pathological diagnosis was confirmed in 155 (63.2%) patients, adenocarcinoma (94.8%) being the predominant type. Metastasis was seen in 204 (83.3%) patients, with liver and abdominal lymph nodes being the frequent sites of metastasis. Most of the patients presented to the surgeons (42.9%) and gastroenterologists (35.9%) at their first visit. Only 89 (26.3%) patients were referred to medical oncologists and 42 (16.7%) of the patients actually received chemotherapy. The patients who received chemotherapy cisplatin and gemcitabine demonstrated partial responses (40%). Common bile duct stricture was seen in 78 patients and stenting was successful in 73 patients. Fourteen (5.7%) patients are alive to date, one is receiving chemotherapy, and another is alive with advanced disease while 10 patients had incidental diagnosis after surgery. Of all 53.9% of patients have died and 38% are lost to follow up. CONCLUSION: Most of the patients with biliary cancers present late with advanced disease at our referral tertiary care hospital. Minority of the patients received chemotherapy and most of responses were observed with cisplatin and gemcitabine combination or capecitbine based therapy.