The Study Of Relationship Between PCNA And Ki67 (Cell Proliferation Markers) And Histologic Parts Of Wilms’s Tumor

Background: Wilm’s tumor is the most frequent primary renal neoplasma in pediatric age group. Classically it is composed of three histologic parts: Blastemal, Epithelial and stromal. Different factors are implicated as prognostic determinants. Nowadays special attention is paid to proliferation markers for determining the biologic behavior of tumors. In this study we tried to ascertain the proliferative index of 22 cases of Wilm’s tumor in our center who have had rather good follow up (at least two years). Materials and Methods: After reviewing the H and E slides, we stained sections with PCNA and ki67 and scanned them by image cytomertry. Then the proliferative indices for each histological part was determined. Results: We resuted that proliferative indices of blastemal and epithelial parts have significant (P< 0.0002) difference (increment) from that of stromal part. Also the patients were divided into those with recurrence (within two ys of primary surgery) and recurrence. The profileration indices of PCNA for those recurring tumors was significantly higher (PCNA= 22.3%) (P= 0.0015). Conclusion: Finally we concluded that using proliferative markers in Wilm’s tumor is useful as an effective prognostic factor

Electron microscopic findings suggestive of focal and segmental glomerulosclerosis in patients with steroid-resistant nephrotic syndrome

Distinction between minimal change disease and unsampled Focal Segmental Glomerulosclerosis is a challenging concept in kidney biopsy of patients with nephrotic syndrome with minimal histopathological findings. This study was performed to compare electron microscopic findings in patients with steroid-resistant nephrotic syndrome with minimal histopathological abnormalities and cases with Focal Segmental Glomerulosclerosis. This Cohort study was conducted in Cancer Institute, Imam Khomeini Hospital Complex, Tehran, Iran. Twenty patients with steroid-resistant nephrotic syndrome and minimal changes on the light microscopic study were selected as case group. Similarly, 20 patients with Focal Segmental Glomerulosclerosis were selected as the control group. Ultrastructural findings were re-evaluated and scored qualitatively (0�3+). In patients with minimal changes on light microscopic evaluation, clinical course of the disease was followed after 5 years. Mean ages of the patients (8 women and 12 men) in case and control groups were 12.9 and 15.9 years, respectively (p > 0.05). There was no significant difference in number of examined glomeruli and sampling from cortico�medullary junction area between the groups. The mean percentage of sclerotic glomeruli in control group was 15.4. Tubular atrophy and interstitial fibrosis were more frequent in control patients. Podocyte proliferation, GBM duplication (involving more than 10 of capillary walls), and moderate to severe multifocal expansion of mesangial matrix were significantly more obvious in FSGS patient samples (p < 0.05). No statistically significant difference was found in severity of cytoplasmic vacuolization, GBM wrinkling and splitting between the groups. Most of (80) the patients with minimal changes improved during the 5-year follow-up. Generally, we concluded that Podocyte proliferation, GBM remodeling, and moderate to severe mesangial matrix expansion are the most reliable findings on electron microscopic examination in favor of FSGS. © 2019, © 2019 Taylor & Francis Group, LLC

Study on SARS-CoV-2 strains in Iran reveals potential contribution of co-infection with and recombination between different strains to the emergence of new strains

We aimed to describe SARS-CoV-2 strains in Iranians from nine distributed cities infected during two months expanding late 2020 and early 2021 by genotyping known informative single nucleotide in five PCR amplicons. Two variants associated with haplotype H1 (clade G) and nine additional variants associated with other haplotypes were genotyped, respectively, in RNA isolates of 244 and 85 individuals. The variants associated with the H1a (GR) and H1b (GH) haplotypes were most prevalent, indicating a significant change in infection pattern with passage of time. The most important findings were that recombinant genomes and co-infection, respectively, were surmised in 44.7 and 12.9 of the samples extensively genotyped. Partners of many of the recombinations were relatively common strains. Co-existing viruses were among those currently circulating in Iran. In addition to random mutations, co-infection with different existing strains and recombination between their genomes may significantly contribute to the emergence of new SARS-CoV-2 strains. © 2021 Elsevier Inc

SARS-CoV-2 outbreak in Iran: The dynamics of the epidemic and evidence on two independent introductions

The SARS-CoV-2 virus has been rapidly spreading globally since December 2019, triggering a pandemic, soon after its emergence. While Iran was among the first countries confronted with rapid spread of virus in February 2020, no real-time SARS-CoV-2 whole-genome tracking in early phase of outbreak was performed in the country. To address this issue, we provided 50 whole-genome sequences of viral isolates ascertained from different geographical locations in Iran during March�July 2020. The corresponding analysis on origins, transmission dynamics and genetic diversity of SARS-CoV-2 virus, represented at least two introductions of the virus into the country, constructing two major clusters defined as B.4 and B.1*. The first entry of the virus might have occurred around very late 2019/early 2020, as suggested by the time to the most recent common ancestor, followed by a rapid community transmission that led to dominancy of B.4 lineage in early epidemic till the end of June. Gradually, reduction in dominancy of B.4 occurred possibly as a result of other entries of the virus, followed by surge of B.1* lineages, as of mid-May. Remarkably, variation tracking of the virus indicated the increase in frequency of D614G mutation, along with B.1* lineages, which showed continuity till October 2020. The increase in frequency of D614G mutation and B.1* lineages from mid-May onwards predicts a rapid viral transmission that may push the country into a critical health situation followed by a considerable change in composition of viral lineages circulating in the country. © 2021 Wiley-VCH GmbH