Small serotonin-positive pancreatic endocrine tumors caused obstruction of the main pancreatic duct

We report 2 cases of pancreatic endocrine tumors that caused obstruction of the main pancreatic duct(MPD).A 49-year-old asymptomatic man was referred to our institution because dilation of the MPD was revealed by abdominal ultrasonography(US).No tumor was detected by endoscopic ultrasonography,computed tomography(CT),and magnetic resonance imaging(MRI).The diameter of the MPD was > 20 mm at the body,and no dilation was noted at the head.Although malignancy was not confirmed through cytology or imaging,pancreatic cancer was strongly suspected.Pancreaticoduo-denectomy was performed.Pathological and immunohistochemical examination revealed a 5 mm × 3 mm serotonin-positive endocrine tumor.Fibrosis was present around the MPD and seemed to cause stricture.A 32-year-old asymptomatic man had elevated serum amylase,and US demonstrated dilation of the MPD.No tumor was detected by CT and MRI.Pancreatic cancer was suspected due to stricture and dilation of the MPD.Pancreatectomy of middle part of pancreas was performed.Pathological and immunohistochemical examination revealed a serotonin-positive endocrine tumor sized 5 mm × 4 mm.We report 2 cases of serotonin-positive pancreatic endocrine tumors that caused stricture of the MPD in spite of the small size of the tumor.

SIGNIFICANCE OF EXPRESS OF SOME NONHORMONAL ANTIGENS IN PANCREATIC ENDOCRINE TUMORS

Objective: To study the express of some nonhormonal antigens in pancreatic endocrine tumors. Methods: The nonhormonal antigens including Alpha subunit of human chorionic gonadotropin (α HCG), progesterone receptors (PR), 7B2, HISL 19, in normal pancreatic islets and in 52 cases of pancreatic endocrine tumors (PET) were investigated by immunohistochemistry. Results: It was found that HCG can be detected in PET but not in normal islet cells. HCG immunoreactivity was expressed by 3 of 28 (10.7%) benign PET and by 14 of 24 (58.3%) malignant PET.PR was found by 20 of 28(71.4%) benign PET and by 7 of 24 (29%) malignant PET. 7B2 was detected by 23 of 28 (82.1%) benign PET and by 13 of 24 (54.2%) malignant PET. HISL 19 was appeared by 23 of 28 benign PET and by 11 of 24 (46%) malignant PET. Golgitype persisted in 87.5% malignant tumors. Conclusion: The assay of nonhormonal antigens may be well defined the clinico pathological characteristics of PET.

STUDY ON EXPRESS OF a-HCG AND a-HCGmRNA IN PANCREATIC ENDOCRINE TUMORS

The antigen Alpha subunit of human chorionic gonadotropin (α HCG) and a HCGmRNA in pancreatic endocrine tumors (PET) were investigated by immuno histochemistry and in situ hybridization. It was found that α HCG can be detected in PET buy not in normal islet cells. α HCG immunoreactivity was expressed by 5 of 28 (18%) in benign PET and 14 of 24 (58.3%) in malignant PET. Using in situ hybridization of α HCGmRNA, a strong signal in PET was obtained. The clinico pathological significance of α HCG in PET was discussed.

Clinical analysis of malignant pancreatic endocrine tumors:reports of 27 cases

To investigate clinicopathological features,diagnosis and treatment of malignant pancreatic tumors.Methods A retrospective clinical analysis was made in 27 cases of malignant pancreatic tumors admitted from 1989 to 2003.Results Tumors were surgically resected in 22 patients.Tumor infiltration into surrounding organs was found in 13 cases.Four patients had lymph nodes metastasis and 5 had liver metastasis.Two cases were found tumor embolus in vascular or lymph tube.Neural invasion was found in 3.Conclusion Malignant pancreatic tumors has good prognosis.Aggressive attempts of surgical management should be performed.6 refs,1 tab.

Pathological differential diagnosis of solid-pseudopapillary neoplasm and endocrine tumors of the pancreas

AIM:To investigate differential points of solid-pseudo-papillary neoplasm (SPN) of the pancreas and pancre-atic endocrine tumor (PET).METHODS:Ten cases of SPN and fourteen cases of PET were studied in this retrospective study. Clinical and pathologic features,immunostaining reactions and β-catenin gene mutations were analyzed.RESULTS:The mean age of SPN patients was 25.6 years and these patients had no specific symptoms. The mean diameter of the tumors was 11.0 cm,9/10 cases were cystic or a mixture of solid and cystic structures,and there was hemorrhage and necrosis on the cut surface in 8/10 (80%) cases. Characteristic pseudo-papillary structure and discohesive appearance of the neoplastic cells were observed in all 10 (100%) cases. The results of immunostaining showed that nuclear expression of β-catenin and loss of E-cadherin in all the cases,was only seen in SPN. Molecular studies discov-ered that 9/10 (90%) cases harbored a point mutation of exon 3 in β-catenin gene. On the other hand,the mean age of PET patients was 43.1 years. Eight of 14 cases presented with symptoms caused by hypoglyce-mia,and the other 6 cases presented with symptoms similar to those of SPN. The mean size of the tumors was 2.9 cm,most of the tumors were solid,only 3/14 (21%) were a mixture of solid and cystic structures,and macroscopic hemorrhage and necrosis were much less common (3/14,21%). Histologically,tumor cells were arranged in trabecular,acinar or solid patterns and demonstrated no pseudopapillary structure and discohesive appearance in all 14 (100%) cases. The results of immunostaining and mutation detection were completely different with SPN that membrane and cytoplastic expression of β-catenin without loss of E-cadherin,as well as no mutation in β-catenin gene in all the cases. CONCLUSION:Both macroscopic and microscopic features of SPN are quite characteristic. It is not difficult to distinguish it from PET. If necessary,immunos-taining of β-catenin and E-cadherin is quite helpful to make the differential diagnosis.

Current surgical management of pancreatic endocrine tumor liver metastases

BACKGROUND: The management of metastatic disease in pancreatic endocrine tumors (PETs) demands a multidisciplinary approach and the cooperation of several medical specialties. The role of surgery is critical, even when a radical excision cannot always be achieved. DATA SOURCES: A PubMed search of relevant articles published up to February 2011 was performed to identify current information about PET liver metastases regarding diagnosis and management, with an emphasis on surgery. RESULTS: The early diagnosis of metastases and their accurate localization, most commonly in the liver, is very important. Surgical options include radical excision, and palliative excision to relieve symptoms in case of failure of medical treatment. The goal of the radical excision is to remove the primary tumor bulk and all liver metastases at the same time, but unfortunately it is not feasible in most cases. Palliative excisions include aggressive tumor debulking surgeries in well-differentiated carcinomas, trying to remove at least 90% of the tumor mass, combined with other additional destructive techniques such as hepatic artery embolization or chemoembolization to treat metastases or chemoembolization to relieve symptoms in cases of rapidly growing tumors. The combination of chemoembolization and systemic chemotherapy results in better response and survival rates. Other local destructive techniques include ethanol injection, cryotherapy and radiofrequency ablation. CONCLUSION: It seems that the current management of PETs can achieve important improvements, even in advanced cases.

Diagnosis and surgical treatment of pancreatic endocrine tumors in 36 patients:a single-center report

Background Pancreatic endocrine tumors （PETs） are rare and their surgical treatment is often debated. The purpose of this retrospective study was to analyze the diagnosis and surgical strategy of functioning and non-functioning PETs. Methods From May 1980 to March 2006, 36 patients with pancreatic endocrine tumors at the Second Affiliated Hospital of Zhejiang University were retrospectively studied. Results Among the 36 patients, 29 （81%） had functioning tumors, and 7 （19%） had nonfunctioning tumors. Ninety-two percent of insulinomas were benign, whereas 4 （57%） of nonfunctioning PETs were malignant. The size of functioning tumors was （2.3i-0.3） cm, that of nonfunctioning tumors was less than （5.1^-0.5） cm. The combination CT and transabdominal ultrasonography resulted in a diagnostic sensitivity of 84%. Thirty-three primary lesions were precisely located in 32 patients （89%）. Atypical tumor resection was performed for 73% of functioning tumors, while typical pancreatectomy was performed for 6 （85%） of nonfunctioning tumors. Moreover, 5 liver resections and 1 lymph node dissection were performed. During the follow-up, fifteen complications occurred in 12 （36%） patients after operation. The 5-year survival rate for patients with benign tumors was 92% compared to 50% for those with malignant tumors. Surgical cure was achieved in 95% of patients with benign insulinomas. Conclusions Surgical strategy for PETs depends on the size and location of the tumor and the risk of malignancy. The optimal surgical procedure is key to prevent postoperative complication. Radical resection including initial and metastatic lesion may benefit patients with maliqnant PETs.

Epidemiological study of a von Hippel-Lindau family in northwest China

von Hippel-Lindau(VHL)disease is a rare,inherited neoplastic disease characterized by hemangioblastomas(HBL)of the central nervous system(CNS),retinal angiomas,renal cell carcinomas(RCC),pancreatic endocrine tumors(PETs),pheochromocytomas,paragangliomas,and visceral cysts.We encountered a large VHL family in northwest China and conducted a systematic screening of the family members based on their epidemiological and clinical characteristics.A self-designed questionnaire was used to collect the general sociodemographic and health information of the family members.For the preliminary family screening,physical examination and abdomen B ultrasonography were performed.The suspected patients were subjected to cranial computerized tomography and fundus examination.The clinical data of the patients with confirmed VHL disease were collected from hospital records.A total of 63 lineal descendants in six generations were observed in the family(generations O,A,B,C,D,E),including 9 dead suspected cases(6 males,3 females)and 10 living cases(2 males,8 females).Among the 10 living cases,4,2,1,3,4,8,and 2 manifested HBLs of the CNS,PETs,RCC,pancreatic cysts,renal cysts,pheochromocytomas(4 hemi and 4 bilateral),and paragangliomas,respectively.Data showed that the morbidity of VHL disease in generation C was lower than that in generation B,but the age of onset was younger.This study is the first to report VHL disease in northwest China and VHL-associated PET cases in Chinese.Therefore,follow-up checkups of the family should be focused on younger generations.Proper family screening protocols should be followed for the treatment of patients with VHL disease.