Rodrigo O Perez

Summary

Publications

  1. doi request reprint Distribution of lymph nodes in the mesorectum: how deep is TME necessary?
    R O Perez
    Department of Gastroenterology School of Medicine, University of Sao Paulo, Sao Paulo, Brazil
    Tech Coloproctol 12:39-43. 2008
  2. ncbi request reprint Endoscopic management of postoperative stapled colorectal anastomosis hemorrhage
    R O Perez
    Department of Gastroenterology, University of Sao Paulo School of Medicine, Sao Paulo, Brazil
    Tech Coloproctol 11:64-6. 2007
  3. doi request reprint Clinical relevance of positron emission tomography/computed tomography-positive inguinal nodes in rectal cancer after neoadjuvant chemoradiation
    R O Perez
    Angelita and Joaquim Gama Institute, Sao Paulo, Brazil
    Colorectal Dis 15:674-82. 2013
  4. doi request reprint Transanal endoscopic microsurgery for residual rectal cancer (ypT0-2) following neoadjuvant chemoradiation therapy: another word of caution
    Rodrigo Oliva Perez
    Angelita and Joaquim Gama Institute, Sao Paulo, Brazil
    Dis Colon Rectum 56:6-13. 2013
  5. doi request reprint Accuracy of positron emission tomography/computed tomography and clinical assessment in the detection of complete rectal tumor regression after neoadjuvant chemoradiation: long-term results of a prospective trial (National Clinical Trial 00254683)
    Rodrigo Oliva Perez
    Angelita and Joaquim Gama Institute, Sao Paulo, Brazil
    Cancer 118:3501-11. 2012
  6. doi request reprint Role of biopsies in patients with residual rectal cancer following neoadjuvant chemoradiation after downsizing: can they rule out persisting cancer?
    R O Perez
    Colorectal Surgery Division, University of Sao Paulo, School of Medicine Angelita and Joaquim Gama Institute, Sao Paulo, Brazil
    Colorectal Dis 14:714-20. 2012
  7. ncbi request reprint Combined resection of the duodenum and pancreas for locally advanced colon cancer
    Rodrigo Oliva Perez
    Colorectal Surgery Division, Department of Gastroenterology, School of Medicine, University of Sao Paulo, Rua Manoel da Nóbrega 1564, 04005001 São Paulo, Brazil
    Curr Surg 62:613-7. 2005
  8. ncbi request reprint Loop ileostomy morbidity: timing of closure matters
    Rodrigo Oliva Perez
    Institute of Colorectal Surgery, Rua Manuel da Nóbrega 1564, 04001 005 São Paulo, SP, Brazil
    Dis Colon Rectum 49:1539-45. 2006
  9. ncbi request reprint Local excision for ypT2 rectal cancer--much ado about something
    Rodrigo O Perez
    Department of Gastroenterology, University of Sao Paulo School of Medicine, Rua Manuel da Nóbrega, 1564, Sao Paulo, SP, 04001 005, Brazil
    J Gastrointest Surg 11:1431-8; discussion 1438-40. 2007
  10. ncbi request reprint Peritumoral inflammatory infiltrate is not a prognostic factor in distal rectal cancer following neoadjuvant chemoradiation therapy
    Rodrigo O Perez
    Department of Gastroenterology, School of Medicine, University of Sao Paulo, Rua Manuel da Nóbrega, 1564, Sao Paulo, SP, 04001 005, Brazil
    J Gastrointest Surg 11:1534-40. 2007

Collaborators

Detail Information

Publications39

  1. doi request reprint Distribution of lymph nodes in the mesorectum: how deep is TME necessary?
    R O Perez
    Department of Gastroenterology School of Medicine, University of Sao Paulo, Sao Paulo, Brazil
    Tech Coloproctol 12:39-43. 2008
    ..However, exact numbers and distribution of lymph nodes (LN) along the mesorectum remains controversial with some studies suggesting that few LNs are present in the distal third of the mesorectum...
  2. ncbi request reprint Endoscopic management of postoperative stapled colorectal anastomosis hemorrhage
    R O Perez
    Department of Gastroenterology, University of Sao Paulo School of Medicine, Sao Paulo, Brazil
    Tech Coloproctol 11:64-6. 2007
    ....
  3. doi request reprint Clinical relevance of positron emission tomography/computed tomography-positive inguinal nodes in rectal cancer after neoadjuvant chemoradiation
    R O Perez
    Angelita and Joaquim Gama Institute, Sao Paulo, Brazil
    Colorectal Dis 15:674-82. 2013
    ....
  4. doi request reprint Transanal endoscopic microsurgery for residual rectal cancer (ypT0-2) following neoadjuvant chemoradiation therapy: another word of caution
    Rodrigo Oliva Perez
    Angelita and Joaquim Gama Institute, Sao Paulo, Brazil
    Dis Colon Rectum 56:6-13. 2013
    ....
  5. doi request reprint Accuracy of positron emission tomography/computed tomography and clinical assessment in the detection of complete rectal tumor regression after neoadjuvant chemoradiation: long-term results of a prospective trial (National Clinical Trial 00254683)
    Rodrigo Oliva Perez
    Angelita and Joaquim Gama Institute, Sao Paulo, Brazil
    Cancer 118:3501-11. 2012
    ..Therefore, assessment of tumor response with positron emission tomography/computed tomography (PET/CT) after neoadjuvant treatment may offer relevant information for the selection of patients to receive alternative treatment strategies...
  6. doi request reprint Role of biopsies in patients with residual rectal cancer following neoadjuvant chemoradiation after downsizing: can they rule out persisting cancer?
    R O Perez
    Colorectal Surgery Division, University of Sao Paulo, School of Medicine Angelita and Joaquim Gama Institute, Sao Paulo, Brazil
    Colorectal Dis 14:714-20. 2012
    ..The study aimed to determine the value of postchemoradiation biopsies, performed after significant tumour downsizing following neoadjuvant therapy, in predicting complete tumour regression in patients with distal rectal cancer...
  7. ncbi request reprint Combined resection of the duodenum and pancreas for locally advanced colon cancer
    Rodrigo Oliva Perez
    Colorectal Surgery Division, Department of Gastroenterology, School of Medicine, University of Sao Paulo, Rua Manoel da Nóbrega 1564, 04005001 São Paulo, Brazil
    Curr Surg 62:613-7. 2005
    ..This procedure is the preferred treatment strategy because it seems to be associated with improved overall survival rates...
  8. ncbi request reprint Loop ileostomy morbidity: timing of closure matters
    Rodrigo Oliva Perez
    Institute of Colorectal Surgery, Rua Manuel da Nóbrega 1564, 04001 005 São Paulo, SP, Brazil
    Dis Colon Rectum 49:1539-45. 2006
    ..Diverting stomas are commonly performed during ileoanal and coloanal anastomoses. We studied a series of patients after loop ileostomy closure to determine risk factors and the impact of the interval from primary operation on morbidity...
  9. ncbi request reprint Local excision for ypT2 rectal cancer--much ado about something
    Rodrigo O Perez
    Department of Gastroenterology, University of Sao Paulo School of Medicine, Rua Manuel da Nóbrega, 1564, Sao Paulo, SP, 04001 005, Brazil
    J Gastrointest Surg 11:1431-8; discussion 1438-40. 2007
    ..In this setting, a possible role for local excision of ypT2 has been suggested...
  10. ncbi request reprint Peritumoral inflammatory infiltrate is not a prognostic factor in distal rectal cancer following neoadjuvant chemoradiation therapy
    Rodrigo O Perez
    Department of Gastroenterology, School of Medicine, University of Sao Paulo, Rua Manuel da Nóbrega, 1564, Sao Paulo, SP, 04001 005, Brazil
    J Gastrointest Surg 11:1534-40. 2007
    ..However, this has not been evaluated in patients submitted to neoadjuvant therapy for distal rectal cancer. For this reason, we decided to study the effect of the presence of this pathological finding on disease recurrence and survival...
  11. doi request reprint Mucinous colorectal adenocarcinoma: influence of mucin expression (Muc1, 2 and 5) on clinico-pathological features and prognosis
    Rodrigo Oliva Perez
    Department of Gastroenterology, University of Sao Paulo School of Medicine, Rua Manuel da Nóbrega, 1564, Sao Paulo, SP, 04001 005, Brazil
    Int J Colorectal Dis 23:757-65. 2008
    ..The purpose of this study was to determine differences in outcomes of patients with mucinous colorectal adenocarcinoma according to the type of mucin expressed...
  12. doi request reprint Lymph node size in rectal cancer following neoadjuvant chemoradiation--can we rely on radiologic nodal staging after chemoradiation?
    Rodrigo O Perez
    Department of Gastroenterology, University of Sao Paulo School of Medicine, Sao Paulo, Brazil
    Dis Colon Rectum 52:1278-84. 2009
    ..The purpose of this study was to determine the difference in size between metastatic and nonmetastatic nodes and the critical lymph node size after neoadjuvant chemoradiation therapy...
  13. doi request reprint The role of carcinoembriogenic antigen in predicting response and survival to neoadjuvant chemoradiotherapy for distal rectal cancer
    Rodrigo O Perez
    Colorectal Surgery Division, University of Sao Paulo School of Medicine, Sao Paulo, Brazil
    Dis Colon Rectum 52:1137-43. 2009
    ..Therefore, we hypothesized that a decrease in CEA after neoadjuvant chemoradiotherapy could reflect tumor response to chemoradiotherapy, affecting final disease stage and ultimately survival...
  14. doi request reprint Transanal endoscopic microsurgery for residual rectal cancer after neoadjuvant chemoradiation therapy is associated with significant immediate pain and hospital readmission rates
    Rodrigo Oliva Perez
    Angelita and Joaquim Gama Institute, Sao Paulo, Brazil
    Dis Colon Rectum 54:545-51. 2011
    ..In this setting, we compared the clinical outcomes of patients undergoing transanal endoscopic microsurgery with and without neoadjuvant chemoradiation...
  15. doi request reprint Absence of lymph nodes in the resected specimen after radical surgery for distal rectal cancer and neoadjuvant chemoradiation therapy: what does it mean?
    Angelita Habr-Gama
    Department of Gastroenterology, University of Sao Paulo School of Medicine, Sao Paulo, Brazil
    Dis Colon Rectum 51:277-83. 2008
    ..However, this finding may not be applicable after neoadjuvant therapy in which, not only is there a decrease in lymph nodes recovered, but also a subgroup of patients with absence of lymph nodes in the resected specimen...
  16. doi request reprint Optimal timing for assessment of tumor response to neoadjuvant chemoradiation in patients with rectal cancer: do all patients benefit from waiting longer than 6 weeks?
    Rodrigo O Perez
    Department of Gastroenterology, Colorectal Surgery Division, University of Sao Paulo School of Medicine, Sao Paulo, Brazil
    Int J Radiat Oncol Biol Phys 84:1159-65. 2012
    ....
  17. doi request reprint Watch and wait approach following extended neoadjuvant chemoradiation for distal rectal cancer: are we getting closer to anal cancer management?
    Angelita Habr-Gama
    1 Angelita and Joaquim Gama Institute, Sao Paulo, Brazil 2 Clinical Oncology Division, Instituto do Cancer do Estado de Sao Paulo ICESP, Sao Paulo, Brazil 3 Department of Gastroenterology, Colorectal Surgery Division, University of Sao Paulo School of Medicine, Sao Paulo, Brazil 4 Department of Radiology, Radiation Oncology Division, University of Sao Paulo School of Medicine, Sao Paulo, Brazil 5 Radiation Oncology Division, Hospital Alemao Oswaldo Cruz, Sao Paulo, Brazil 6 Ludwig Institute for Cancer Research, Sao Paulo Branch, Sao Paulo, Brazil
    Dis Colon Rectum 56:1109-17. 2013
    ..No immediate surgery (Watch and Wait) has been considered in select patients with complete clinical response after neoadjuvant chemoradiation to avoid postoperative morbidity and functional disorders after radical surgery...
  18. ncbi request reprint Patterns of failure and survival for nonoperative treatment of stage c0 distal rectal cancer following neoadjuvant chemoradiation therapy
    Angelita Habr-Gama
    Department of Gastroenterology, University of Sao Paulo School of Medicine, and Hospital Alemão Oswaldo Cruz HAOC, Sao Paulo, Brazil
    J Gastrointest Surg 10:1319-28; discussion 1328-9. 2006
    ..Survival in these patients is significantly affected by systemic failure. Exclusive local failure occurs late after CRT completion and is frequently amenable to salvage therapy...
  19. doi request reprint Increasing the rates of complete response to neoadjuvant chemoradiotherapy for distal rectal cancer: results of a prospective study using additional chemotherapy during the resting period
    Angelita Habr-Gama
    Angelita and Joaquim Gama Institute, Sao Paulo, Brazil
    Dis Colon Rectum 52:1927-34. 2009
    ..The purpose of this study was to evaluate toxicity rates and the impact of an extended neoadjuvant chemoradiation regimen on complete response rates...
  20. doi request reprint Complete clinical response after neoadjuvant chemoradiation therapy for distal rectal cancer: characterization of clinical and endoscopic findings for standardization
    Angelita Habr-Gama
    Department of Gastroenterology, University of Sao Paulo School of Medicine, Sao Paulo, Brazil
    Dis Colon Rectum 53:1692-8. 2010
    ....
  21. doi request reprint Nonoperative approaches to rectal cancer: a critical evaluation
    Angelita Habr-Gama
    Angelita and Joaquim Gama Research Institute, Hospital Alemao Oswaldo Cruz, Sao Paulo, Brazil
    Semin Radiat Oncol 21:234-9. 2011
    ..Advances in radiation and medical oncology could potentially lead to significant improvements in complete tumor regression rates, leading to an increase in importance of a minimally invasive approach in patients with rectal cancer...
  22. ncbi request reprint Aortoenteric fistula to the sigmoid colon-case report
    Rodrigo O Perez
    Colorectal Surgery Division, Department of Gastroenterology, School of Medicine, University of Sao Paulo, Sao Paulo, Brazil
    Curr Surg 62:49-54. 2005
    ..This study reports a rare type of secondary aortoenteric fistula to the left colon, and it describes an unusual and successful surgical treatment...
  23. doi request reprint The need for effective radiosentitizing agents: experience in patients with complete pathological response
    Angelita Habr-Gama
    Department of Gastroenterology, Angelita and Joaquim Gama Institute, Sao Paulo, Brazil
    Anticancer Drugs 22:308-10. 2011
    ..The balance between complete pathological response and toxicity should aid in the management decision for the use of radiosensitizing agents in the neoadjuvant setting for the treatment of rectal cancer...
  24. ncbi request reprint Clinicopathologic and immunohistochemistry characterization of synchronous multiple primary gastric adenocarcinoma
    Ulysses Ribeiro
    Department of Gastroenterology, University of Sao Paulo School of Medicine, Sao Paulo, Sao Paulo, 01327 002, Brazil
    J Gastrointest Surg 11:233-9. 2007
    ..Two routes of carcinogenesis, mutator, and suppressor appear to be involved independently in the development of synchronous tumors...
  25. ncbi request reprint Negative pressure post-extubation pulmonary edema complicating appendectomy in a young patient: case report
    Rodrigo O Perez
    Colorectal Surgery Division, Department of Gastroenterology, School of Medicine, University of Sao Paulo, Sao Paulo, Brazil
    Curr Surg 61:463-5. 2004
    ..The present paper reports this potentially serious complication illustrating the main radiological findings consistent with alveolar hemorrhage in this setting and the treatment performed...
  26. doi request reprint Rectal and pouch recurrences after surgical treatment for familial adenomatous polyposis
    Fabio Guilherme Campos
    Colorectal Surgery Division, Department of Gastroenterolgy, University of Sao Paulo School of Medicine, Sao Paulo, Brazil
    J Gastrointest Surg 13:129-36. 2009
    ..The present work is aimed to analyze the outcome after surgical treatment regarding complications and cancer recurrence...
  27. pmc Operative versus nonoperative treatment for stage 0 distal rectal cancer following chemoradiation therapy: long-term results
    Angelita Habr-Gama
    Colorectal Surgery Division, Department of Gastroenterology, University of Sao Paulo School of Medicine, Sao Paulo, Brazil
    Ann Surg 240:711-7; discussion 717-8. 2004
    ..Report overall long-term results of stage 0 rectal cancer following neoadjuvant chemoradiation and compare long-term results between operative and nonoperative treatment...
  28. ncbi request reprint Surgical treatment of familial adenomatous polyposis: ileorectal anastomosis or restorative proctolectomy?
    Fabio Guilherme Campos
    Colorectal Service, Hospital das Clinicas, Faculdade de Medicina, Universidade de Sao Paulo, Sao Paulo, SP, Brazil
    Arq Gastroenterol 46:294-9. 2009
    ..Controversy regarding the best operative choice for familial adenomatous polyposis lays between the morbidity of restorative proctocolectomy and the supposed mortality due to rectal cancer after ileorectal anastomosis...
  29. ncbi request reprint Lymph node micrometastasis in stage II distal rectal cancer following neoadjuvant chemoradiation therapy
    Rodrigo Oliva Perez
    Colorectal Surgery Division, Department of Gastroenterology, University of Sao Paulo Medical School, Sao Paulo, SP 04001 005, Brazil
    Int J Colorectal Dis 20:434-9. 2005
    ..The objective was to determine the presence and frequency of micrometastasis in lymph nodes of patients with rectal cancer treated by preoperative chemoradiation followed by curative resection...
  30. doi request reprint Interval between surgery and neoadjuvant chemoradiation therapy for distal rectal cancer: does delayed surgery have an impact on outcome?
    Angelita Habr-Gama
    Habr Gama Research Institute, Sao Paulo, SP, Brazil
    Int J Radiat Oncol Biol Phys 71:1181-8. 2008
    ..The purpose of this study is to evaluate whether this interval has an impact on survival...
  31. pmc Are histological alterations observed in the gallbladder precancerous lesions?
    Adriana Lúcia Agnelli Meirelles-Costa
    Department of Gastroenterology, Gastrointestinal Surgery Unit, Laparoscopic Surgery Unit, Faculdade de Medicina da Universidade de São Paulo São Paulo SP, Brazil
    Clinics (Sao Paulo) 65:143-50. 2010
    ..Unfortunately, little is known currently about its etiology or pathogenesis. A better understanding of its carcinogenesis and determining risk factors that lead to its development could help improve the available treatment options...
  32. ncbi request reprint Lower limb compartment syndrome associated with Lloyd-Davies/lithotomy position in colorectal surgery
    Rodrigo Oliva Perez
    Department of Gastroenterology, University of Sao Paulo School of Medicine, Sao Paulo, Brazil
    Hepatogastroenterology 51:100-2. 2004
    ..Moreover, they point out some preventive measures that can be observed to lower the incidence of this condition in patients exposed for a long period to this position during colorectal or urological operations...
  33. ncbi request reprint Laparoscopic versus standard appendectomy outcomes and cost comparisons in the private sector
    Claudio Bresciani
    Department of Gastroenterology, Laparoscopic Surgery Unit, University of Sao Paulo, School of Medicine, Sao Paulo, Brazil
    J Gastrointest Surg 9:1174-80; discussion 1180-1. 2005
    ..However, these results have to be carefully examined and weighed, because overall costs and operating room costs were significantly higher in the laparoscopy group...
  34. ncbi request reprint Radical surgery for colorectal metastatic melanoma
    Rodrigo Oliva Perez
    Colorectal Surgery Division, Department of Gastroenterology, University of Sao Paulo Medical School, Sao Paulo, SP, Brazil
    Int J Colorectal Dis 20:292-3. 2005
  35. ncbi request reprint Preoperative chemoradiation therapy for low rectal cancer. Impact on downstaging and sphincter-saving operations
    Angelita Habr-Gama
    Division of Coloproctology, Department of Gastroenterology, University of Sao Paulo, Brazil
    Hepatogastroenterology 51:1703-7. 2004
    ..Preoperative chemoradiation therapy (CRT) associated with radical surgery may result in significant tumor downstaging, local control of the disease and high rates of sphincter-saving operations...
  36. ncbi request reprint Long-term results of preoperative chemoradiation for distal rectal cancer correlation between final stage and survival
    Angelita Habr-Gama
    Colorectal Surgery Division, Department of Gastroenterology, University of Sao Paulo School of Medicine, Sao Paulo, Brazil
    J Gastrointest Surg 9:90-9; discussion 99-101. 2005
    ..Cancer-related overall and disease-free survival may be correlated to final pathologic staging following neoadjuvant CRT for distal rectal cancer. Also, stage 0 is significantly associated with improved outcome...
  37. ncbi request reprint Complications of gastrectomy with lymphadenectomy in gastric cancer
    Bruno Zilberstein
    Department of Gastroenterology, University of Sao Paulo School of Medicine, Av 9 de Julho 4440, Sao Paulo, SP, 01406 100, Brazil
    Gastric Cancer 7:254-9. 2004
    ....
  38. ncbi request reprint Microsatellite instability in solitary and sporadic gastric cancer
    Rodrigo Oliva Perez
    Disciplines of Surgery of the Digestive Tract and Coloproctology, Hospital das Clinicas, Faculty of Medicine, University of São Paulo São Paulo SP, Brazil
    Rev Hosp Clin Fac Med Sao Paulo 59:279-85. 2004
    ..Identification of specific genetic pathways in gastric cancer may have direct impact on prognosis and selection of treatment strategies...
  39. ncbi request reprint Familial gastric cancer
    Claudio Bresciani
    Gastroenterology Department of the São Paulo University Medical School, Sao Paulo, SP, Brazil
    Arq Gastroenterol 40:114-7. 2003
    ..Diffuse familiar gastric cancer is defined as any family presenting: two first-degree relatives with diffuse gastric cancer, one of them with age under 50 years or at least 3 first-degree relatives irrespective age of onset...