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Biomedical subjects

John P Duffy

Publications and source records attributed to John P Duffy.

At least 19 recordsLinked to original sources

Postresection hepatic failure: successful treatment with liver transplantation.

Postoperative liver failure (PLF) is a rare but often fatal complication of major hepatic resection. Use of orthotopic liver transplantation (OLT) for PLF remains undefined. We conducted a retrospective review of 435 patients who underwent hepatic resection between 1990 and 2004; 9 of them (2.0%) developed PLF. Indications for resection included primary hepatic malignancies (8), colonic metastases (2), and echinococcic cyst (1); all resections were multisegmental, 6 were extended, and 2 were lobectomies. A total of 7 patients underwent OLT at a mean of 25 days after resection. Patients developing PLF had significantly lower preoperative platelet counts and significant elevations of total bilirubin, direct bilirubin, prothrombin time, and international normalized ratio (INR) by postoperative day 2. Pathological cirrhosis and extended right lobectomy were associated with significantly increased risk of PLF. Following OLT, there were no in-hospital deaths, but 1 patient required retransplantation for primary nonfunction. Mean survival with and without OLT was 42.2 and 1.4 months, respectively (P = 0.03). Following OLT, 1- and 5-yr patient survivals were 88% and 40%, respectively; 1- and 5-yr graft survivals were 75% and 34%, respectively. In conclusion, patients with low platelets, biopsy-proven cirrhosis, or those undergoing extended resection are at increased risk for PLF. OLT for PLF has significant morbidity but allows salvage of an otherwise fatal condition.

Adult↗

A study exploring the role of intercostal nerve damage in chronic pain after thoracic surgery.

OBJECTIVE: Our aim was to investigate the prevalence of intra-operative nerve damage and its association with chronic pain. METHODS: Our prospective study of 33 patients used nerve conduction studies to assess intercostal nerve function during elective thoracic surgical procedures. We used two methods to study nerve conduction: pre-operative magnetic stimulation (in 10 patients) and intra-operative nerve conduction studies (in all patients) We correlated these findings with specific intra-operative parameters, pain and psychological questionnaires pre-op and 3 month post-op and altered cutaneous sensation. RESULTS: Magstim (magnetic stimulation) assessments were not reliable and were therefore abandoned. Intraoperative intercostal nerve studies revealed two distinct patterns of nerve injury and also that nerve injury was less in those cases where a rib was not resected. However, intercostal nerve damage detected at the time of operation is not associated with chronic pain or altered cutaneous sensation at 3 months post-op. CONCLUSIONS: The study findings suggest that either the amount of intra-operative intercostal nerve damage is not indicative of long-term nerve damage or that there is a more significant cause for chronic pain other than intercostal nerve injury.

Aged↗

A questionnaire study investigating the prevalence of the neuropathic component of chronic pain after thoracic surgery.

OBJECTIVE: Our questionnaire study set out to assess the prevalence of chronic pain after thoracic surgery, the contribution of the neuropathic component of chronic pain and the impact of chronic pain on patients' lives. METHODS: A questionnaire was sent to 1152 patients who had undergone thoracic surgery in our department between 7 months and 7 years ago. The questionnaire was designed specifically for the study and included questions on neuropathic symptoms. Responses were correlated with data from our prospectively entered database for analysis. RESULTS: Nine hundred and forty-eight people were included in the study, of which 600 responded (63%). Prevalence of chronic pain is 57% at 7-12 months, 36% at 4-5 years and 21% at 6-7 years. Patient age, consultant and time since the operation all have significant effects. Surgical approach (video-assisted thoracoscopic surgery, thoracotomy) and diagnosis are not significant. Thirty-nine percent of those with pain take analgesia, 46% felt their pain is their worst medical problem and 40% reported it limits their daily activities. The prevalence of each neuropathic symptom is between 35 and 83%. The presence of a neuropathic symptom is associated with significantly more severe pain, more analgesia use and pain more likely to limit daily activity. CONCLUSIONS: Chronic pain has a significant prevalence and impact on patients' lives for several years after thoracic surgery. Nerve dysfunction is associated with more severe pain, a greater impact and tends to persist. The reason for the individual consultant being an important factor in post-thoracotomy pain needs further investigation.

Adolescent↗

Unplanned splenectomy during oesophagectomy does not affect survival.

OBJECTIVE: There are limited and conflicting data available concerning the incidence of inadvertent splenectomy and its impact on the outcome in patients who have undergone oesophagectomy. The aim of this study is to identify the factors associated with a likelihood of inadvertent splenectomy and its influence on early and long-term outcome in patients having oesophagectomy for oesophageal carcinoma. METHODS: A consecutive series of 738 oesophagectomies performed between 1991 and 2004 was analysed. In our practice, the spleen was removed only if damaged intraoperatively. Routine chemo- and immunoprophylaxis would subsequently be used. Multivariate analysis with logistic and Cox models determined significant variables. RESULTS: Of the 738 oesophagectomies, 48 (6.5%) had splenectomy. Neoadjuvant chemotherapy was administered to a minority of patients; none subsequently had splenectomy. There were significant differences between types of operation (Ivor-Lewis 18 (9.0%), left thoracolaparotomy 14 (9.9%) and left thoracophrenotomy 15 (3.9%), p=0.01). Splenectomy was more common with advanced N stage disease (OR=0.44 [0.20-0.95]; p=0.04). Splenectomy resulted in more blood transfusions (median, 2 units vs 0 units; p=0.03) more anastomotic leaks (7 [14.6%] vs 42 [6.1%]; p=0.02) but not an increase in pulmonary complications (p=0.64) or in-hospital mortality (1 [4.6%] vs 37 [5.4%]; p=0.30). Splenectomy did not significantly affect median survival (551 [332-770] days vs 627 [554-700] days; p=0.63). CONCLUSION: Although inadvertent splenectomy increased the morbidity of oesophagectomy, it did not impair survival. Type of operation and advanced N stage are important risks for splenectomy. Though best avoided, most of the consequences of splenectomy can be managed. An unexpected relationship between splenectomy and anastomotic leaks needs further investigation.

Adenocarcinoma↗

Survival after esophageal resection for carcinoma: the importance of the histologic cell type.

BACKGROUND: The significance of tumor cell type on survival after esophageal resection for carcinoma is uncertain. We reviewed our experience in order to compare the outcome in the two main histologic groups. METHODS: Between January 1987 and April 2000, 621 patients underwent esophagectomy with curative intention for squamous cell carcinoma or adenocarcinoma. The postoperative outcomes of patients with adenocarcinoma and squamous cell carcinoma were compared. RESULTS: Of the cohort, 424 patients had adenocarcinoma (group A) and 197 had squamous cell carcinoma (group B). The commonest approach in group A was a left thoracotomy (67%), while in group B, it was an Ivor Lewis resection (55%) (p < 0.0001). Operative mortality was 3.5% for group A and 8.1% for group B (p = 0.03). Cardiorespiratory complication rate was similar, but anastomotic leaks occurred more frequently in group B (4.2% vs 8.6%, p = 0.04). Patients in group B tended to have earlier pathologic tumor, node, metastasis (pTNM) stage (p = 0.06). Overall, survival was significantly better for group B (p = 0.003). Group B had a significantly better survival than group A in lymph node (LN) negative status (p = 0.01), and a relatively improved survival in LN positive status (p = 0.35). On multivariate analysis, squamous cell subtype (p = 0.034), pTNM stage (p = 0.005), LN status (p = 0.008), and completeness of resection (p = 0.028) were significant predictors of survival. CONCLUSIONS: After esophagectomy, patients with squamous cell carcinoma have a poorer perioperative outcome as compared with those with adenocarcinoma. However, in the longer term, squamous cell type appears to confer a significant survival advantage.

Adenocarcinoma↗

Histological determinants of survival in completely resected T1-2N1M0 nonsmall cell cancer of the lung.

BACKGROUND: The histologic determinants of survival after surgical resection of stage II nonsmall cell lung cancer are poorly understood. We analyzed the prognostic significance of a number of histologic features after complete resection of T1-2N1M0 nonsmall cell cancer of the lung. METHODS: The case notes and histology of all patients who underwent a potentially curative surgical resection for T1-2N1M0 nonsmall cell carcinoma of the lung between 1991 and 1997 were reviewed retrospectively. The following histologic factors were recorded: histologic type of tumor; number of nodes with metastatic deposits together with their nodal station; the presence of vascular invasion, visceral pleural involvement, and cellular necrosis; and grade of tumor. The results from 98 patients were analyzed. Univariate and multivariate analyses were performed to identify prognostic factors. RESULTS: Univariate analysis showed that only three factors had a statistically significant correlation with a poor prognosis: vascular invasion (p = 0.002), nonsquamous histology (p = 0.005), and visceral pleural involvement (p = 0.002). Multivariate analysis revealed that all three factors were significant independent adverse prognostic indicators. CONCLUSIONS: Visceral pleural involvement, nonsquamous histology, and vascular invasion are all significant adverse prognostic factors after surgical resection of T1-2N1M0 nonsmall cell cancer of the lung. These findings conflict with previously published reports, and we advocate a prospective, large-scale study in order to clarify the prognostic significance of histologic characteristics in stage II disease.

Carcinoma, Non-Small-Cell Lung↗

Redo antireflux surgery--the importance of a tailored approach.

OBJECTIVE: Although several studies have examined early outcome following redo antireflux surgery, there is little data on the long-term efficacy of these procedures. We reviewed our experience of these operations in order to assess the long-term results which can be achieved by choosing redo antireflux procedures based on the results obtained from pre-operative oesophageal function testing. METHODS: The case notes of 26 patients who underwent a repeat antireflux procedure between 1981 and 2000 were reviewed. Clinical history, examination, endoscopy, pH studies, oesophageal manometry and video barium contrast studies were performed on all patients prior to re-operation. In all cases, a standardised pre-formulated algorithm, based on the results of the pre-operative oesophageal function tests, was used to determine the choice of surgical procedure. Post-operatively, patients were classified into three groups: Group A (those with no symptoms), Group B (symptoms controlled by medication) and Group C (symptoms refractory to medical treatment). Patients in Groups B and C underwent repeat oesophageal function studies. RESULTS: In all cases, the indication for re-operation was gastro-oesophageal reflux symptoms refractory to medical treatment. Twenty-one patients (81%) underwent a left thoracotomy, of whom 11 patients (42%) underwent a gastroplasty. The mean follow-up period was 8.27 years (range 1.5-19.8 years), after which 14 patients (54%) were classified as Group A; 10 patients (38%) as Group B; and 2 patients (8%) as Group C. Within Groups B and C, manometry showed that re-operation had increased basal lower oesophageal sphincter pressure (4.6 vs 12.7 mmHg, pre- vs post-operative P=0.03), and in all, but one case pH studies showed no evidence of recurrent acid reflux. CONCLUSIONS: Redo antireflux surgery can provide complete symptomatic relief in approximately 50% of patients and symptomatic improvement over 90% of patients. We advocate a tailored approach in the selection of re-operative procedures based on the results of pre-operative oesophageal function testing.

Adolescent↗

Nerve growth factor stimulates MMP-2 expression and activity and increases invasion by human pancreatic cancer cells.

Pancreatic cancer frequently invades and migrates along neural tissue. Although the exact mechanisms are unknown, perineural invasion negatively impacts prognosis for pancreatic cancer patients. Matrix metalloproteinases (MMPs) are overexpressed in pancreatic cancer and are associated with poor prognosis. We hypothesized that nerve growth factor (NGF) released from neural tissue increases the invasive properties of pancreatic cancer cells. In the present study we investigated the effect of NGF on the expression and activity of MMP-2 in human pancreatic cancer cells. NGF dose dependently increased MMP-2 protein in the culture medium and stimulated MMP-2 gelatinolytic activity. This effect was mediated by specific binding of NGF to its receptor trk A, which was detected on all pancreatic cancer cells, with subsequent activation of the p44/42 MAPK signaling pathway. The NGF-induced increase in MMP-2 expression and activity lead to an enhanced invasion in vitro. These findings support the hypothesis that neurotrophic factors, e.g., NGF, are critically involved in mediating perineural invasion of pancreatic cancer.

Cell Line, Tumor↗

PGE(2) is generated by specific COX-2 activity and increases VEGF production in COX-2-expressing human pancreatic cancer cells.

In some cancers cyclooxygenase (COX) inhibition appears to be anti-mitogenic and anti-angiogenic, but the actions of COX-derived prostaglandins in pancreatic cancer (PaCa) are unknown. In this study COX-2 was detected in three of six PaCa cell lines while COX-1 was identified in all cell lines. COX-2 expression correlated with basal and arachidonic acid (AA) stimulated PGE(2) production. PGE(2) production was inhibited by the COX-2 inhibitor nimesulide. In COX-2 expressing cells, exogenous AA and PGE(2) increased VEGF synthesis via the EP(2) receptor. Whereas PGE(2) stimulated intracellular cAMP formation in COX-2 positive and negative cells, 8-bromo cAMP stimulated VEGF production only in COX-2 expressing cells. Stimulating COX-2 expressing PaCa cell lines with AA enhanced migration of endothelial cells, an effect which was inhibited by a COX-2 inhibitor and EP(2) receptor antagonist. These data identify a subset of human PaCa cell lines that express functional COX-2 enzyme. PGE(2) generated by specific COX-2 activity increases VEGF secretion in human PaCa cells through an autocrine mechanism.

8-Bromo Cyclic Adenosine Monophosphate↗

Influence of hypoxia and neoangiogenesis on the growth of pancreatic cancer.

As with other solid tumors, the growth and metastasis of pancreatic cancer is critically dependent on tumor angiogenesis. A major stimulus for a tumor's recruitment of additional blood vessels is cellular hypoxia, a condition which is especially pronounced in this neoplasm. Hypoxia induces transcriptional activation of genes that alter cellular metabolism and promote neoangiogenesis. Pancreatic cancer cells have demonstrated activation of such adaptive pathways even in the absence of hypoxia. A highly-angiogenic response in this neoplasm correlates with increased tumor growth, increased metastasis, and decreased survival. Pancreatic cancers expressing high levels of vascular endothelial growth factor, a potent pro-angiogenic cytokine, also have a higher incidence of metastasis and poorer prognosis. Pancreatic cancer cells uniquely express receptors for vascular endothelial growth factor, indicating a role for an autocrine loop in tumor proliferation and invasion. Multiple experimental anti-angiogenic strategies, many of which target vascular endothelial growth factor, reduce pancreatic cancer growth, spread, and angiogenesis. Anti-angiogenic treatments for pancreatic cancer will likely be most effective when used as an integral part of a combination chemotherapeutic regimen.

Animals↗

Improved survival for adenocarcinoma of the ampulla of Vater: fifty-five consecutive resections.

HYPOTHESIS: After resection of an adenocarcinoma of the ampulla of Vater, certain clinical and pathologic characteristics influence long-term survival. DESIGN: Retrospective case series. SETTING: Major academic medical and pancreatic surgical center. PATIENTS: Fifty-five consecutive patients who underwent Whipple resection for ampullary adenocarcinoma from 1988 through 2001. INTERVENTIONS: Pylorus-preserving Whipple resection in 32 patients and standard Whipple resection in 23 patients. MAIN OUTCOME MEASURES: Postoperative survival. A multivariate Cox proportional hazards model was used to determine the effects of various factors on long-term survival after resection. RESULTS: There were no operative deaths, and all patients left the hospital. After a mean follow-up of 46.9 months, the overall 5-year Kaplan-Meier survival estimate was 67.7%. The median survival of the entire group has not yet been reached. Five-year postoperative survival estimates for node-negative (n = 32) and node-positive patients (n = 23) were 76.5% and 53.4%, respectively (P =.26). Patients whose tumors demonstrated perineural invasion (n = 12) had a 5-year survival estimate of 29.2% vs 78.8% for those whose did not (P<.001). On multivariate analysis, the absence of perineural invasion (P<.001) was an independent predictor of significantly improved postoperative survival. CONCLUSIONS: Compared with previous reports from our own and other centers, this series demonstrates improved postoperative survival by 10% to 20% in patients undergoing Whipple resection for adenocarcinoma of the ampulla of Vater. The reasons for this improved outcome are unclear, and the effect of adjuvant treatment cannot be determined from this analysis. The major factor associated with prolonged survival was the absence of perineural invasion in the resected tumor specimen.

Adenocarcinoma↗

Pneumonectomy for stage I (T1N0 and T2N0) nonsmall cell lung cancer has potent, adverse impact on survival.

BACKGROUND: Surgically treated, stage I (T1N0 and T2N0) nonsmall cell lung cancer has a relatively favorable prognosis. Our aim was to determine whether performing a pneumonectomy in this group of patients has an impact on survival. METHODS: Four hundred eighty-five patients with stage I nonsmall cell lung cancer undergoing lung resection between 1991 and 2000 were studied. Three hundred seventy-four patients underwent a smaller resection than a pneumonectomy and 111 had a pneumonectomy. RESULTS: Patients undergoing less extensive resections were older (mean age, 65 vs 63 years) (p = 0.01); these patients were also more likely to have a history of chronic obstructive airway disease (9% vs 2%) (p = 0.01) or asthma (10% vs 3%) (p = 0.04), nonsquamous cell type (56% vs 27%) (p < 0.0001), and T1 tumor stage (66% vs 17%) (p = 0.002) than patients having a pneumonectomy. Operative mortality was 2.4% versus 8% (p = 0.01). Overall 1-, 3-, and 5-year Kaplan-Meier survival rates (95% confidence interval [CI]) after less extensive resections were 85% (CI, 82% to 90%), 63% (CI, 56% to 69%), and 50% (CI, 42% to 57%), respectively, and after pneumonectomy the survival rates were 66% (CI, 53% to 73%), 47% (CI, 35% to 57%), and 44% (CI, 32% to 55%), respectively (p = 0.0006). When the Cox proportional hazards model was applied to all study patients (n = 485), pneumonectomy (p = 0.001), T2 stage (p = 0.006), older age (p = 0.03), and male gender (p = 0.03) were independent adverse predictors of survival. When the analysis was limited to the patients having T1N0 disease (n = 145), pneumonectomy (p = 0.0008), older age (p = 0.05), and nonsquamous cell type (p = 0.02) were independent adverse determinants of survival. When only the patients with T2N0 disease were analyzed (n = 340), male gender (p = 0.0005) and pneumonectomy (p = 0.01) were independent negative predictors of survival. CONCLUSIONS: In this study, the patients who underwent pneumonectomy for stage T1N0 or T2N0 nonsmall cell lung cancer had a significantly poorer survival than those patients who underwent smaller lung resections.

Age Factors↗

Glial cell-derived neurotrophic factor upregulates the expression and activation of matrix metalloproteinase-9 in human pancreatic cancer.

BACKGROUND: We have previously reported that the glial cell-derived neurotrophic factor (GDNF) promotes pancreatic cancer cell invasion in vitro. The purpose of this study was to determine whether GDNF regulates the expression and activation of matrix metalloproteinase-9 (MMP-9) in human pancreatic cancer cells. METHODS: We used human pancreatic cancer cell line MIA PaCa-2. The effect of GDNF on mRNA and protein expression was measured by Northern blot, Western blot and enzyme-linked immunosorbent assay. MMP proteolytic activity was detected by gelatin zymography. To determine which intracellular pathways were involved, we used the following inhibitors: tyrosine kinase inhibitor Genistein, MEK-1 inhibitor PD98059 and PI3-K inhibitor Wortmannin. RESULTS: GDNF increased MMP-9 mRNA and protein expression in MIA PaCa-2 cells in a dose-dependent manner. Treatment with GDNF enhanced gelatinolytic activity of the pro and active form of MMP-9. Inhibitor experiments showed that the expression and activity of pro MMP-9 was totally inhibited by Genistein and partially by Wortmannin, whereas PD98059 had no effect. All three compounds inhibited the activity of the active form of MMP-9. CONCLUSIONS: GDNF upregulates the expression and enzymatic activity of MMP-9 through different signaling pathways in MIA PaCa-2. These findings suggest that GDNF modulates MMP-9 expression and activation, and this may promote pancreatic cancer invasion.

Culture Media↗

Pancreatic neoplasms.

PURPOSE OF REVIEW: This review describes significant basic science and clinical advances in the field of pancreatic neoplasms. RECENT FINDINGS: Some of the genetic and molecular bases for the aggressive behavior of pancreatic cancer have been uncovered, and new targets for therapy have been identified. Various techniques for diagnosis and staging of this disease-endoscopic ultrasound, laparoscopy-continue to undergo evaluation. Surgical results show slightly improved long-term survival, and perioperative mortality rates remain low. The concept that locally invasive pancreatic cancer can be effectively downstaged and later resected has been called into question. Regional chemotherapy has shown promise, especially when combined with immunotherapy. Intraductal papillary mucinous tumors continue to be commonly encountered and their development and clinical course intensely studied. Acinar cell carcinomas are rare pancreatic neoplasms associated with postresection survival longer than ductal adenocarcinoma but shorter than endocrine carcinoma. Neoplasms metastatic to the pancreas can be resected safely and with improved survival compared with nonsurgical therapies. SUMMARY: The treatment of pancreatic neoplasms remains a major challenge for physicians and surgeons. Future progress requires sound scientific inquiry and continued clinical diligence.

Journal Article↗

Laparoscopic Nissen fundoplication improves quality of life in patients with atypical symptoms of gastroesophageal reflux.

Laparoscopic Nissen fundoplication has been shown to improve overall quality of life (QOL) in patients with gastroesophageal reflux, but most studies have not addressed patients with atypical symptoms. We investigated the effect of laparoscopic Nissen fundoplication on QOL using the Gastrointestinal Quality of Life Index (GIQLI) survey modified to address both typical (heartburn, regurgitation, dysphagia) and atypical (hoarse voice, chronic cough, adult-onset asthma, vocal cord polyps) symptoms. One-hundred forty-eight patients underwent laparoscopic Nissen fundoplication for gastroesophageal reflux disease (GERD) at UCLA Medical Center from January 1, 1995 to May 1, 2002. Surveys evaluating pre- and postoperative QOL were administered after surgery: 55 per cent of patients responded (82/148). Forty-eight per cent of all patients (72/148) had atypical symptoms. Perioperative morbidity and mortality were 8.8 per cent and 0.7 per cent, respectively. Mean length of postoperative stay was 2.96 +/- 1.5 days. Mean follow-up for the entire cohort was 18.5 months. Postoperative dysphagia not present before surgery occurred in 4.7 per cent of patients. Eighty per cent of patients were medication-free following surgery. QOL scores for all participants increased significantly from 52.5 +/- 15.3 preoperatively to 72.0 +/- 14.9 postoperatively (P < 0.0001). Patients with atypical symptoms or typical symptoms alone showed significant mean QOL score increases from 48.3 +/- 17.6 preoperatively to 71 +/- 15.7 postoperatively (P < 0.0001) and from 55.7 +/- 12.6 to 72.8 +/- 14.4 (P < 0.0001), respectively. Laparoscopic Nissen fundoplication can effectively improve overall QOL for patients with GERD. Patients with atypical GERD symptoms can experience increases in QOL similar to those with only typical gastrointestinal symptoms.

Adult↗

Surgical treatment of chronic pancreatitis.

Debilitating abdominal or back pain remains the most common indication for surgery in patients with chronic pancreatitis. The surgical approach to chronic pancreatitis should be individualized based on pancreatic and ductal anatomy, pain characteristics, baseline exocrine and endocrine function, and medical co-morbidity. No single approach is ideal for all patients with chronic pancreatitis. Pancreatic ductal drainage with pancreaticojejunostomy targets patients with a dilated pancreatic duct and produces good early postoperative pain relief; however, 30%-50% of patients experience recurrent symptoms at 5 years. Resection for chronic pancreatitis should be considered (1) when the main pancreatic duct is not dilated, (2) when the pancreatic head is enlarged, (3) when there is suspicion of a malignancy, or (4) when previous pancreaticojejunostomy has failed. Re-sectional strategies include pancreaticoduodenectomy, distal pancreatectomy, total pancreatectomy, duodenum-preserving pancreatic head resection (Beger procedure), or local resection of the pancreatic head with longitudinal pancreaticojejunostomy (Frey procedure). Superior results are obtained when the pancreatic head is resected, either completely (pancreaticoduodenectomy) or partially (Beger or Frey procedure). Although pylorus-preserving pancreaticoduodenectomy remains the gold standard resection procedure, there is evidence that newer operations, such as the Beger resection, may be as effective in regard to pain relief and better in respect to nutritional repletion and preservation of endocrine and exocrine function.

Chronic Disease↗

Do women live longer following lung resection for carcinoma?

OBJECTIVE: To determine whether patient gender affects the outlook following lung resection for non-small cell lung cancer (NSCLC). PATIENTS AND METHODS: Prospectively collected data on 833 patients undergoing lung resection for NSCLC between 1990 and 2000 in a single unit were analysed. RESULTS: 581 patients were male (mean age 64.7 +/- 7 years) and 252 were female (mean age 62.6 +/- 7.8 years) (P=0.006). Male patients were more likely to have a history of ischaemic heart disease (P=0.03), to have poorer preoperative spirometry as demonstrated by their % predicted FEV1 (P=0.02) and to need pneumonectomy (P=0.0001) than their female counterparts. Squamous cell carcinoma was the predominant histological cell type in men and adenocarcinoma in women (P<0.0001). There was a trend towards a lower pathological stage among women, but this was not significant. Operative mortality for men was 4.6 and 1.2% for women (P=0.01). Overall 5-year survival for men was 34.2 +/- 2.65% and 47.5 +/ - 4.2% for women (P=0.001) and, for the hospital survivors, was 36.5 +/- 2.7% and 48.1 +/- 4.2%, respectively (P=0.01). On univariate analysis, older age, the need for pneumonectomy and higher pathological stage were significant adverse factors whereas squamous cell type and female gender were significant favourable factors for survival (P<0.05). On Cox proportional hazards model (with and without hospital deaths), pathological stage (P<0.0001), female gender (P=0.0006) and squamous cell type (P=0.001) were independent predictors of survival. The survival was significantly better for women having squamous cell (P=0.01) or non-squamous cell cancers (adenocarcinoma and other) (P=0.002). Regarding the stage, women had a significant survival advantage at pathological stage I (P=0.01) and a relatively better survival at stage II and stage III disease (P=0.3). CONCLUSIONS: This study suggests that female gender exerts a significant positive effect on survival following lung resection for NSCLC. This effect is pronounced at early disease stage and persists after adjusting for important differences in the clinical, histo-pathological features and extent of pulmonary resection between male and female patients.

Adult↗