Medicine
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This repository contains the published and unpublished research of the Faculty of Medicine by the staff members of the faculty
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Item Tracing the progress of Pathology in Sri Lanka – Part II: undergraduate and postgraduate teaching in Pathology.(College of Pathologists of Sri Lanka, 2019) Hewavisenthi, J.; Mudduwa, L.No abstract availableItem Detection of micrometastasis in LYMPH nodes using reverse transcription polymerase chain reaction (RT-PCR) for Cytokeratin 20 (CK-20): are we under staging rectal cancer(The College of Surgeons of Sri Lanka and SAARC Surgical Care Society, 2003) Wijesuriya, S.R.E.; Kuruppuarachchi, K.O.R.; Deen, K.I.; Weerasinghe, A.; Ramesh, R.; Hewavisenthi, J.INTRODUCTION: Postoperative adjuvant chemotherapy in rectal cancer is determined by the presence of metastases in lymph nodes. Detection of LYMPH node metastases is routinely performed by light microscopy. Conventional histology may not detect all metastases especially following neoadjuvant therapy (NAT). CK-20 is a cytokeratin known to be specific to colonic epithelium which may help detection of rectal cancer metastases in lymph nodes. OBJECTIVE: To detect micro metastases in lymph nodes in patients with rectal cancer. staged node negative by routine histology. METHODS: Mesenteric lymph nodes from patients who have undergone NAT for rectal cancer were harvested during surgery. Nodes were bisected and one half sent for Haernatoxylin and eosin (H&E) staining and evaluated by a single pathologist, while the other half was examined for CK 20 by RT-PCR. The technique was validated by testing lymph nodes with known metastases and nodes from patients without cancer. 21 lymph nodes from 6 patients (median age 46 years, range 25-55) which were negative for tumour deposits by H&E stain were assessed for micro metastases. RESULTS: All 2 l nodes which were histologically negative for metastases were positive for micro metastases (positive predictive value l 00%) whilst 2 nodes with known metastases were positive for CK-20, 3 nodes from non-cancer patients were negative for CK-20. CONCLUSION: Detection of CK-20 is accurate in identification of micro metastases of rectal cancer to lymph nodes. Assessment of nodes by H&E histology risks under staging lymph node micro metastases in rectal cancer.Item Result of trans-anal inter-sphincteric resection(taisr) combined with total mesorectal excision (ime) and colo- anal anastomosis for distal rectal cancer(The College of Surgeons of Sri Lanka and SAARC Surgical Care Society, 2003) Deen, K.I.; Rajendra, S.; Hewavisenthi, J.; Perera, M.T.P.R.; Satheesan, B.INTRODUCTION: The treatment of distal rectal cancer is controversial. Most prefer abdomino-perineal excision because of the potential for wide local clearance. Staplers have limitations in restorative resection for distal rectal cancer. OBJECTIVE: To audit the results ofcombinning TAISR with TME and handsewn colo-anal anastomosis for distal rectal cancer. METHODS: I 08 Patients (45 male, median age 59 years, range -22-87) with rectal cancer underwent abdomino-perineal resection -15 ( 14%), Hartmann's procedure - 7 (6.5%), anterior resection -39 (36%) and anterior resection or total colectomy with TAISR and colo-anal anastomosis -47 (43.5%). TAISR was undertaken for tumours between O and 7 ems from the anal verge for rectal cancer with familial polyposis. Data sought were; overall survival, local clearance (RO- clear margins; R l-at least one involved margin) and local recurrence at 24 month median follow up (range- 5 -89 months). Data in the TAISR group were compared with the rest by the test for proportions. Significance was assigned to p<0.05. RESULTS: For the entire group, operative 30-day mortality was 4.6%. Overall disease related mortality at 24 months was 18%. For the entire group, curative resection (RO) was achieved in 93(86%) { TAISR- 39 of 47 (83%) vs. resection without TAJSR- 54 of61(88.5%)- P>0.05}. Overall, local recurrence was seen in 8 (7.4%) {TAISR - 4 of 47 (8.5%) vs. resection without TAISR- 4 of 61 (6.5%). CONCLUSION: There was no significant difference in achievement of free resection margins and local recurrence, in the-short-term, employin anal inter-sphincteric resection with TME for distal rectal cancer co with resection for proximal rectai cancer. Trans-anal inter-sphincteric r with TME for distal rectal cancer is safe in trained hands and should preferred choice in surgical management of distal rectal cancer.Item Clinical outcome of patients having neo-adjuvant therapy(NAT) for rectal cancer: a case control study(The College of Surgeons of Sri Lanka and SAARC Surgical Care Society, 2003) Wijesuriya, S.R.E.; Deen, K.I.; Hewavisenthi, J.; Ratnayake, G.INTRODUCTION: From July i 999 we have employed NAT on a selective basis in the management of rectal cancer. OBJECTIVE: To explore the value of NAT in patients with rectal cancer in the short term. To study the effect of Neo Adjuvant Therapy for rectal carcinoma in the short term. METHODS: Two abdomino perineal resections and 24 anterior resections were done in the NAT group and 5 and 2 l in the no NAT group. There were 2 perioperative deaths in NAT group and one in the no NAT group (P 0.75). There were 7 Cancer related deaths in the NAT group and 6 in the no NAT group (P = l). The survival was 15 month (5 -45) for the NAT group and 16 (3 -54) for the non NAT group (P = I). There were no difference in the recurrences (2 vs 4 P ""0.67) metastasis (4 vs 4 P = 1) or complication (8 vs 2 p =0.08) abdomino perineal resections were performed in 2 patients in the NAT group and 5 in the no NAT group. Anterior resections were performed in 24 patients and 24 patients in NAT and no NAT groups. CONCLUSION: Overall there was no significant difference in the clinical out come between those given NAT and those not given.Item Manual of basic cervical cytology(National Cancer Control Programme,Colombo, 2001) Kumarasinghe, P.; Hewavisenthi, J.No abstract availableItem General pathology made easy(Faculty of Medicine, University of Kelaniya, 2017) Hewavisenthi, J.No abstract availableItem Colorectal cancer burden and trends in a South Asian cohort: experience from a regional tertiary care center in Sri Lanka(Biomed Central, 2017) Chandrasinghe, P.C.; Ediriweera, D.S.; Hewavisenthi, J.; Kumarage, S.K.; Fernando, F.R.; Deen, K.I.OBJECTIVE: Colorectal cancer (CRC) burden is increasing in the south Asian region due to the changing socio-economic landscape and population demographics. There is a lack of robust high quality data from this region in order to evaluate the disease pattern and comparison. Using generalized linear models assuming Poisson distribution and model fitting, authors describe the variation in the landscape of CRC burden along time since 1997 at a regional tertiary care center in Sri Lanka. RESULTS: Analyzing 679 patients, it is observed that both colon and rectal cancers have significantly increased over time (pre 2000-61, 2000 to 2004-178, 2005 to 2009-190, 2010 to 2014-250; P < 0.05). Majority of the cancers were left sided (82%) while 77% were rectosigmoid. Over 25% of all CRC were diagnosed in patients less than 50 years and the median age at diagnosis is < 62 years. Increasing trend is seen in the stage at presentation while 33% of the rectal cancers received neoadjuvant chemoradiation. Left sided preponderance, younger age at presentation and advanced stage at presentation was observed. CRC disease pattern in the South Asian population may vary from that observed in the western population which has implications on disease surveillance and treatment.Item Overall survival of elderly patients having surgery for colorectal cancer Is comparable to younger patients: results from a South Asian population(Hindawi Publishing Corporation, 2017) Chandrasinghe, P.C.; Ediriweera, D.S.; Nazar, T.; Kumarage, S.; Hewavisenthi, J.; Deen, K.I.INTRODUCTION: There has been a continuous debate on whether elderly patients with colorectal cancer (CRC) fair worse. The aim of this study is to assess the thirty-day mortality (TDM) and overall survival (OS) of elderly patients undergoing surgery for CRC. METHOD: OS between two groups (≥70 versus <70 years) having surgery for CRC was analyzed. Demographics, tumour characteristics, and serological markers were considered as independent factors. Multivariable analysis was done using the Cox proportional hazard model. We also compared overall survival in the elderly versus those <60 and <50 years. RESULTS: 477 patients, 160 elderly (55% male; median age 75, range 70-89) and 317 younger patients (49% male; median age 55, range 16 to 69), were studied. Overall survival in CRC patients ≥70 is comparable to <70 (P = 0.45) and <60 years (P = 0.08). Poor OS was observed in the ≥70 versus <50 years (P = 0.03). TDM in the elderly was poor (P < 0.05). Postoperative cardiac complication was the only determinant affecting survival in the elderly (P = 0.01). CONCLUSION: OS in elderly CRC patients having surgery is not worse compared to <70 and <60 years although the TDM was higher. Postoperative cardiac complications significantly affected OS in those ≥70 compared to those <50 years. Chronological age alone should not negatively influence surgical decision-making in the elderly.Item Histological analysis of chronic inflammatory patterns in the gall bladder(International Organization of Scientific Research (IOSR), 2016) Hasan, R.; Abeysuriya, V.; Hewavisenthi, J.; Wijesinghe, J.A.A.S.INTRODUCTION: Cholecystectomy is a common surgical procedure. Inflammatory disease is the most common pathology of the gallbladder. OBJECTIVE: To assess the different morphological changes of chronic cholecystitis in cholecystectomy specimens. METHODS: Thirty histological specimens from cholecystectomies from patients clear clinical history of biliary lithiasis were histologically evaluated with Haematoxylin-Eosinstaining. Three samples were obtained from fundus, middle third and the neck respectively from each gallbladder. RESULTS: 76% of the specimens had metaplastic epithelial changes. Hyperplasia showed a positive correlation (1.0000) with chronic inflammation. Regenerative morphology of epithelial cells was found in 73% of the cases. Regenerative epithelium showed a positive correlation (1.0000) with presence of neutrophils and was significantly associated with mucosal erosions (P=0.005). Fibrosis was observed in all cases (26% mild, 62% moderate, 12% severe). Moderate degree showed a positive correlation (0.999) with severe chronic inflammation. Activity was present in 29% of the cases. Muscular thickness was considered mild in 55% of cases, moderate in 37%, and severe in 8%. Adipose tissue deposits were mild in 47% of cases, moderate in 38%, and severe in 15%. Evolution of the chronic inflammatory cholecystitis was observed in four stages. Initial stage is characterized by mild fibrosis, often with cellular foci, admixed with granulation type tissue in superficial portions of the wall, mild to moderate mononuclear infiltrate and absence of Rockitansky Aschoff sinus(RAS). The second stage consisted of moderate fibrosis and inflammatory infiltrate, often with mild amounts of adipose tissue with RAS extending in to one-third of the length of the specimen. The third stage showed severe fibrosis and chronic inflammation, with moderate to severe adipose tissue deposits with RAS extending in to two-third of the length. The final stage was that of severe fibrosis, often laminated, with reduction of adipose tissue, a moderate to severe inflammatory infiltrate with RAS extending almost entire length of the specimen. CONCLUSION: Staging of chronic inflammatory changes in the gallbladder might help in evaluation of the cholecystectomy specimen, to give a rational, systematic, and reproducible diagnosis of different patterns of the inflammatory process.Item Histopathology reporting in colorectal cancer: a proforma improves quality(Wiely-Blackwell, 2009) Siriwardana, P.N.; Pathmeswaran, A.; Hewavisenthi, J.; Deen, K.I.AIM: The histopathology report is vital to determine the need for adjuvant therapy and prognosis in colorectal cancer (CRC). Completeness of those in text format is inadequate. This study evaluated the improvement of quality of histopathology reports following the introduction of a template proforma, based on standards set by the Royal College of Pathologists (RCP), UK. METHOD: Sixty-eight consecutive histopathology reports based on 19 items for rectal cancer (RC) and 15 items for colon cancer (CC) using the proforma were prospectively analysed and compared with results of a previous audit of 82 consecutive histopathology reports in text format. The percentage of reports containing a statement for each data item for both series was compared using the Normal test for difference between two proportions. Completeness of each report was assessed and a percentage score (percentage completeness) was given. Mean percentage completeness was calculated for each format and compared using the two sample t-test. RESULTS: Except for comments on the presence of 'histologically confirmed liver metastases' in CC and RC, 'distance from dentate line' and 'distance to circumferential margin' in RC, all other items were commented in more than 90% of reports, where 71% of the items based on the minimum data set were present in all reports. Compared to prose format, the mean percentage completeness (SD) improved from 74% (8) to 91% (4) (P < 0.0001) and from 81% (5) to 99% (1) (P < 0.0001) for RC and CC respectively in template proforma format. CONCLUSION: A template proforma and surgeon's contribution in relation to operative findings improves the quality of the histopathology report in CRC.