Pseudorosette-Like Proliferations of the Endometrium.

The endometrium displays a wide spectrum of appearances in both neoplastic and non-neoplastic tissue. Unusual proliferations are not infrequently encountered and may lead to misinterpretation. In this study, we investigated pseudorosette-like proliferations (PLPs) found within the endometrial stroma which, to our knowledge, have not been previously reported. Nineteen endometrial samples with PLPs were identified over a period of 5 yr. Characteristics of the endometrium in which the PLPs were arising as well as patient information were recorded for each case. In addition, residual tissue from 10 of the cases was immunostained for cytokeratin, CD10, smooth muscle actin, S-100, and caldesmon to better characterize the lesions. In all cases the endometrium was in the proliferative phase and none of the patients reported the use of exogenous hormones. In 89% (17 of 19) of the cases, PLPs were present as a single focus; 2 cases showed multiple PLPs. Of the 10 immunostained cases, 90% (9 of 10) showed strong/diffuse staining for smooth muscle actin. Six cases showed negative or weak (1+) staining for CD10, whereas 3 showed moderate (2+) and 1 showed strong (3+) staining. In all cases the PLPs were negative for cytokeratin AE1/AE3, S-100, and caldesmon. These studies suggest that PLPs are benign proliferations with smooth muscle differentiation.

Re-emergence Nipah - a review.

There was an outbreak of new emergence viral encephalitis caused by Nipah virus among humans in some areas of Bangladesh during 2001 - till to date. The disease affected mainly the young, had increased suspicion to spread from bat to man through eating of the same fruits. The risk of human-to-human transmission is thought to be low though many of the affected individuals belonged to the same family. The disease presented mainly as acute encephalitis with usually a short incubation period of less than two weeks, with the main symptoms of fever, headache, and giddiness followed by coma. Distinctive clinical signs include areflexia, hypotonia, hypertension, tachycardia and segmental myoclonus. Serology was helpful in confirming the diagnosis. Magnetic resonance imaging (MRI) showed distinctive changes of multiple, discrete or confluent small high signal lesions, best seen with fluid-attenuated inversion recovery (FLAIR) sequences. Mortality was as high as 32-92% and death was probably due to severe brainstem involvement. Relapse encephalitis was seen in those who recovered from acute encephalitis, and late-onset encephalitis was seen in those with initial non-encephalitic or asymptomatic diseases. Both these manifested as focal encephalitis arising from recurrent infection.

Tumoral Morphologic Features From Cervical Biopsies That Are Predictive of a Negligible Risk for Nodal Metastasis and Tumor Recurrence in Usual-type Cervical Adenocarcinomas: A Multi-institutional Study.

The metastatic or recurrent potential of localized human papillomavirus-associated endocervical adenocarcinoma (HPVA EAC) is difficult to predict, especially based upon biopsy alone. Recent analyses of small cohorts indicate that high tumor nuclear grade (TNG) and the presence of necrotic tumor debris (NTD) from HPVA EACs in cervical biopsy specimens are highly predictive of nodal metastasis (NM). In the present study, we aimed to investigate how reliably tumoral morphologic features from cervical biopsy specimens predict NM or tumor recurrence (TR) and patient outcomes in a large cohort of endocervical adenocarcinoma patients. A cohort comprised of 397 patients with HPVA EAC treated at 18 institutions was identified, and cervical biopsies were paired with their associated complete tumor resections for a total of 794 specimens. A variety of tumoral histologic features were examined for each paired specimen, including TNG (assessed on a 3-tiered scale of increasing abnormalities-TNG1, TNG2, TNG3) and NTD (defined by the presence of necrotic and apoptotic tumor cells within tumor glandular lumens admixed with granular and eosinophilic amorphous material and inflammatory cells), which were correlated with outcomes. The distribution of TNG in biopsies was as follows: 86 (21.7%) TNG1, 223 (56.2%) TNG2, and 88 (22.2%) TNG3. NTD was identified in 176 (44%) of the biopsy specimens. The sensitivity, specificity, positive predictive value, and negative predictive value of a TNG1 assignment in the biopsy being predictive of the same assignment in the full resection were 0.82 (95% confidence interval [CI]: 0.7-0.9), 0.895 (0.86-0.93), 0.593 (0.48-0.696), and 0.96 (0.94-0.98), respectively. Respective values for an NTD-negative status were 0.89 (95% CI: 0.83-0.92), 0.715 (0.64-0.77), 0.72 (0.65-0.77), and 0.89 (0.83-0.93), respectively. Compared with the other cases in each category, both TNG1 and an NTD-negative status were each significantly associated with lower rates of NM (odds ratio for TNG1=0.245, 95% CI: 0.070-0.857, P=0.0277; for NTD=0.199, 95% CI: 0.094-0.421, P<0.0001) and TR (odds ratio for TNG1=0.225, 95% CI: 0.051-0.987, P=0.0479; for NTD=0.367, 95% CI: 0.171-0.786, P=0.0099) independent of depth of stromal invasion, lymphovascular invasion, tumor size, FIGO stage, and Silva pattern. Overall, 73/379 (19%) cases were both TNG1 and NTD-negative on the biopsy, and none of these 73 cases showed NM (0%), but a single case (1.4%) showed TR. In contrast, among the 324 biopsies with TNG2/3 and/or presence of NTD, 62 (19.1%) had NM, and 41 (12.9%) had TR. In summary, 2 variables in combination (ie, TNG1 and NTD-negative) identified a subset of HPVA EAC patients-∼19%-with a 0% frequency of nodal metastases and only 1.4% frequency of recurrence. Biopsies highly but imperfectly predicted these features. Nonetheless, these findings may potentially be of clinical utility in the risk stratification of patients with HPVA EACs. This may allow some patients with a minimal risk of nodal metastases and TR to be identified at the biopsy phase, thereby facilitating more personalized, possibly less aggressive treatment.

Hyper reactive malarial splenomegaly (HMS).

Hyper reactive malarial splenomegaly (HMS) is a relatively rare chronic complication of malaria. Previous name of the disease was Tropical splenomegaly syndrome (TSS). It is seen in endemic zone of malaria. In Bangladesh it is very rare. It is more prevalent in Africa, India, Sri Lanka, Thailand etc. It is due to abnormal immune response to malaria. Recently we got a typical case of HMS in our pediatric department of Community Based Medical College Hospital (CBMCH) Mymensingh. The patient, a seven years old boy came from Haluaghat, Mymensingh, which is a hyper endemic zone of malaria. The boy had history of repeated attack of malaria with huge chronic splenomegaly for five years. Antibody to malaria was positive & titer was markedly raised. Other causes of massive splenomegaly namely chronic Kala azar, Typhoid, congenital hemolytic anemia, Leukaemia, Lymphoma etc were excluded by laboratory examination. The boy was discharged with malaria prophylaxis for a long time & advised to come to our unit every month for further follow up.

Helicobacter pylori infection and adenocarcinoma arising in Barrett's esophagus.

Helicobacter pylori infection has been implicated in the development of chronic active gastritis and gastric neoplasms (ie, mucosa-associated lymphoid tumors and adenocarcinoma). The potential association between esophageal H pylori infection with Barrett's esophagus-associated adenocarcinoma has not been previously studied. Nineteen cases of adenocarcinoma arising in Barrett's esophagus were examined for the presence of H pylori. Barrett's esophagus was defined by the presence of metaplastic specialized-type epithelium (gastric-type epithelium with goblet cell metaplasia) in the distal esophagus. To detect the presence of H pylori, 5-microm sections, from several tissue blocks in each case, were stained with routine hematoxylin-eosin, modified Giemsa, and an antibody directed against H pylori (Dako a/s, Denmark, Lot # 111061). Stained sections were examined independently by two pathologists. All three staining methods failed to show H pylori in any of the cases examined. Sections of Barrett's esophagus (with and without dysplasia), adenocarcinoma, and stomach (when available) were uniformly negative for the presence of H pylori. We conclude that neither gastric nor esophageal infection with H pylori is a requisite for the development of adenocarcinoma in Barrett's esophagus. Moreover, it is unlikely that a significant association between H pylori infection and Barrett's-associated adenocarcinoma exists.

p53 as a significant prognostic marker in endometrial carcinoma.

Although several studies have reported that p53 overexpression is associated with poor survival from endometrial cancer, this relationship might be confounded by a number of possible factors. The objective of this study was to examine the prognostic role of p53 overexpression in endometrial cancer when a panel of well-selected potential confounding factors were controlled. One hundred and twenty-five endometrial cancers were examined for p53 overexpression by immunohistochemistry (IHC). Demographic and clinical data, including age at diagnosis, race, residence, tumor grade, surgical stage, and other possible confounding factors for endometrial cancer such as diabetes, family history of cancer, hypertension, hormone replacement therapy (HRT), and obesity were collected from medical charts and pathologic reports. Survival status was determined at the end of follow-up. The Kaplan-Meier method was used to derive the survival curve, while the log-rank test was used to compare curves for two or more groups of patients. The proportional hazards regression model was used to obtain maximum likelihood estimates of relative risks (RR) and their 95% confidence intervals. Compared to the p53 nonaltered group, the presence of p53 overexpression in endometrial carcinoma was related to significantly decreased patient survival. High nuclear grade and high FIGO stage were associated with poor survival. No obvious association was found between survival and study site, race, age, and other potential risk factors of endometrial cancer. Only two variables (p53 and stage) were significantly associated with poor survival in the multivariate proportional hazards analysis. Overexpression of p53 was found to be the most significant predictor of specific survival. The relative risk for p53 overexpression was 7.46 (95% CI: 4.26-13.1) and for late stage was 4.35 (95% CI: 1.91-9.92). We conclude that p53 overexpression is the most important predictor for patient survival when a panel of well-selected potential confounding factors are taken into account. Patients with endometrial cancers who have p53 overexpression have a seven-fold higher risk of dying from disease compared to those without p53 overexpression. Whether detection of p53 alteration may serve as an indicator of high-risk patients for whom more aggressive adjuvant chemotherapy may be considered needs to be explored in the future.

Fluorescent in situ hybridization analysis of cervical smears. A pilot study of 20 cases.

The Papanicolaou smear has been established as a useful cytological screening tool that has greatly contributed to the reduction of cervical cancer related mortalities. This test, however, cannot reveal underlying genetic damage, i.e., numerical and structural chromosomal abnormalities that may predispose an individual to a future potentially life-threatening cervical neoplasm. An assay that has the ability to detect genetic abnormalities in interphase cervical mucosal cells will be a useful complement to the Papanicolaou smear on cytological preparations. The present project explores such a possibility using the technique of fluorescent in situ hybridization (FISH). The chromosome 8 specific alpha-satellite probe is initially used because of our past experience in the validation of this probe in various cancers. The applicability of this assay, however, is not restricted to the use of this particular probe. Data on our initial pilot study of 20 cases revealed that such an interphase FISH assay is indeed feasible as a potential future screening tool for cervical cancer.

Basal cell adenocarcinoma of the salivary gland: an ultrastructural and immunohistochemical study.

OBJECTIVE: The purpose of this study was to examine the ultrastructural and immunohistochemical characteristics of basal cell adenocarcinoma. STUDY DESIGN: Three cases of basal cell adenocarcinoma of the salivary glands were studied by means of light microscopy, electron microscopy, and immunohistochemistry. RESULTS: Some of the architectural tumor patterns encountered were solid, some were trabecular, and some were mixed. Ultrastructurally, solid areas were composed of nonluminal cells, some of which contained tonofilaments and well-formed desmosomes; tubulo-trabecular areas differentiated into both luminal and nonluminal cells. Both growth patterns were associated with the formation of excess basal lamina, marginally and between nonluminal cells. Myofilaments were infrequent in nonluminal cells of solid or trabecular areas. Cytokeratin (AE1/AE3) stained all 3 tumors, more peripherally in the solid pattern and usually centrally in the trabecular areas; vimentin stained all 3 tumors diffusely; smooth muscle actin (IA4) stained all 3 tumors but was mainly confined to peripheral tumor cells in both the solid and the trabecular growth patterns; epithelial membrane antigen and carcinoembryonic antigen stained 1 of the 3 tumors, predominantly in the luminal cells; p53 oncoprotein was focally positive in 2 of the 3 tumors; Ki-67 stained less than 5% of the tumor cells in all cases; and c-erb-B2 was uniformly negative in all cases. Staining patterns of cytokeratin and actin varied with the architecture of the tumor. CONCLUSIONS: Neither ultrastructural characteristics nor immunohistochemistry findings appear to distinguish basal cell adenocarcinoma from basal cell adenoma.

Benign and malignant serous and endometrioid epithelium in the omentum.

OBJECTIVES: Benign and malignant serous and endometrioid epithelial proliferations are found in the omentum, where their presence may be interpreted either as metastases from Müllerian tumors elsewhere or as primary peritoneal tumors. The present study was undertaken in an attempt to gather data that might help resolve the issue. METHODS: The ratios of serous epithelium to endometrioid epithelium in the omentum, in both the benign and malignant states, were determined for cases from January 1985 to July 1997 and January 1991 to December 1997, respectively. RESULTS: In ovarian carcinoma, the ratio of malignant serous epithelium to endometrioid epithelium involving the omentum is 15:1. This is comparable to the ratio of benign serous epithelium to endometrioid epithelium in the omentum, which is 10:1. The ratio of primary peritoneal serous carcinoma to endometrioid carcinoma is 10.5:1. CONCLUSION: It seems not reasonable that endometrioid carcinoma of the ovary is 15 times less likely to metastasize to the omentum than its serous counterpart. The ratio, however, is not unreasonable if endometrioid and serous carcinomas arise from preexisting endometrioid or serous epithelium. We conclude that serous and endometrioid carcinomas may arise primarily in the omentum and, in at least some cases, may derive from their benign counterparts.

Co-infection of malaria and gamma-herpesvirus: exacerbated lung inflammation or cross-protection depends on the stage of viral infection.

In order to study the interaction between a gamma-herpesvirus and malaria we established a co-infection model that involves infection of mice with murine gamma-herpesvirus (MHV-68) and Plasmodium yoelii non-lethal strain (PYNL). To investigate the interaction between acute malaria and the lytic stage of MHV-68, the timing of infections was chosen such that the peak virus and parasite burdens would be present at the same time. Under this condition, we observed significant mortality in co-infected mice and aggressive lung inflammation with a marked influx of neutrophils and megakaryocytes. If mice were latently infected with MHV-68 and then co-infected with malaria we noticed significantly less viral load and parasitaemia. Using MHC/peptide tetramer staining we found that acute malaria reduces the anti-MHV-68 CD8+ T cell response in the animals that develop severe disease. Our study provides important fundamental information, which will be of use when devising strategies to combat infections with more than one agent, a situation that often occurs naturally.

p53 immunoreactivity in endometrial metaplasia with dysfunctional uterine bleeding.

AIM: Overexpression of p53 has been reported in endometrial carcinomas, especially in uterine papillary serous carcinoma (UPSC), to correlate with worse prognosis. Endometrial metaplasia is commonly encountered in patients with dysfunctional uterine bleeding (DUB) and may on occasion be difficult to distinguish from atypical endometrial hyperplasia or carcinoma on biopsies. The present study was initiated in the belief that metaplastic tissue might not show overexpression of p53 and would thus help to distinguish it from carcinomas of non-endometrioid histology. METHODS AND RESULTS: Paraffin-embedded tissue of endometrial biopsies with papillary metaplasia (22 cases), tubal metaplasia (five cases) and eosinophilic meta-plasia (seven cases) from patients with DUB were immunostained for p53 immunoreactivity. No evidence of hyperplasia was noted in any of the cases selected for the study. Twenty-eight cases of UPSC were included for comparison. Our study showed p53 overexpression in 25 of 28 (89%) UPSC. Weak and heterogeneous p53 immunoreactivity was present in 10 of 22 (45%) papillary metaplasias, four of five (80%) tubal metaplasias and four of seven (57%) eosinophilic metaplasias. Follow-up of 16-45 (median 32) months was unremarkable except for one patient with eosinophilic metaplasia who had simple endometrial hyperplasia in subsequent biopsy. CONCLUSIONS: The presence of weak and heterogeneous p53 immunoreactivity in metaplastic endometrium is unexpected and might be a consequence of DNA damage. Intense, diffuse and homogeneous p53 staining favours carcinoma.

Molecular analysis of inhibin A and activin A subunit gene loci in epithelial ovarian cancer.

Inhibin A (alpha-betaA) and activin A (betaA-betaA) are biochemically similar proteins that generally have opposite biologic functions. For example, while inhibin (alpha subunit) is proposed to be a tumor suppressor in some types of ovarian cancer, activin appears to stimulate tumor development. Previous reports suggest that a loss of alpha inhibin subunit expression and elevated serum activin levels are associated with human epithelial ovarian cancer (EOC). Our objective was to examine the alpha inhibin subunit gene locus on chromosome 2q for evidence of loss of heterozygosity (LOH) in cases of EOC and to correlate these results with serum activin A levels measured in the same patients. Ovarian tumor and matched healthy tissue samples were collected from 22 women with EOC. DNA was extracted and subjected to PCR analysis using 10 primers, seven from chromosome 2q (alpha inhibin subunit locus) and, as a control, three from chromosome 7p (inhibin/activin betaA subunit). In addition, each patient had a preoperative serum activin A measurement using an ELISA assay. One (1/22) case of EOC demonstrated LOH for one microsatellite marker at the alpha inhibin gene locus. Thirty-six percent (8/22) of patients had an activin A level that was increased above the normal range. We conclude that loss of heterozygosity at the inhibin/activin alpha subunit locus is not frequently associated with EOC. More direct molecular analyses of the inhibin and activin genes are warranted to rule out mutations in cases of epithelial ovarian cancer.

Atypical squamous metaplastic cells: reproducibility, outcome, and diagnostic features on ThinPrep Pap test.

BACKGROUND: Atypical squamous metaplastic (ASM) cells are associated with high-grade squamous intraepithelial lesions (HGSIL) in many cases. The reproducibility of the diagnosis and biopsy follow-up results of cases designated as ASM were studied at Women and Infants' Hospital of Rhode Island. METHODS: Of 180 patients with ASM who the authors examined from January 1, 1998 to September 30, 1998, 147 (81.7%) had subsequent biopsies. Results of the biopsies were tallied. Twenty cases were rescreened in a blinded fashion to determine intra- and interobserver agreement and to identify diagnostic features. RESULTS: Sixty-five (44.2%) cases of ASM had HGSIL on biopsy, 26 (17.7%) had low-grade squamous intraepithelial lesion, and 56 cases (38.1%) were benign. Overall individual consistency is 8 of 16 (50%), and overall agreement is 13 of 64 (20%). CONCLUSIONS: Sixty-two percent of cases designated as ASM cytologically were associated with SIL, primarily HGSIL, at biopsies. The findings underscore the importance of this subcategory of atypical squamous cells. However, poor reproducibility suggests the need for refined criteria and/or continuing education, and obtaining second opinion. Cancer (Cancer Cytopathol)

Fluorescent in situ hybridization assessment of chromosome copy number in buccal mucosal cells.

Sex chromatin (Barr body) analysis of buccal mucosal cells has been recognized for many years as an inexpensive, noninvasive and rapid means of sex determination. The conventional Barr body analysis using Papanicolaou stain was discontinued as a routine test because of its lack of reliability and its inability to detect mosaicism and other chromosomal abnormalities. With the advent of recombinant DNA technology and the availability of molecular probes, however, the value of this simple albeit obsolete test should be re-evaluated. The results of the authors' experience in optimizing a fluorescent in situ hybridization (FISH) assay on buccal mucosal cells are described. The utility and potential of this assay are explored and discussed.