CRISPR/Cas9 application in cancer therapy: a pioneering genome editing tool.

The progress of genetic engineering in the 1970s brought about a paradigm shift in genome editing technology. The clustered regularly interspaced short palindromic repeats/CRISPR associated protein 9 (CRISPR/Cas9) system is a flexible means to target and modify particular DNA sequences in the genome. Several applications of CRISPR/Cas9 are presently being studied in cancer biology and oncology to provide vigorous site-specific gene editing to enhance its biological and clinical uses. CRISPR's flexibility and ease of use have enabled the prompt achievement of almost any preferred alteration with greater efficiency and lower cost than preceding modalities. Also, CRISPR/Cas9 technology has recently been applied to improve the safety and efficacy of chimeric antigen receptor (CAR)-T cell therapies and defeat tumor cell resistance to conventional treatments such as chemotherapy and radiotherapy. The current review summarizes the application of CRISPR/Cas9 in cancer therapy. We also discuss the present obstacles and contemplate future possibilities in this context.

A Case with Complete Pancreatic Aplasia Suggestive of Johanson-Blizzard Syndrome.

Johanson-Blizzard Syndrome (JBS) is a very rare autosomal recessive multisystem disorder. We report the case of a two-month-old male with pancreatic insufficiency and severe phenotypic features. His diagnosis of JBS was established using clinical symptoms and abdominal computed tomography scan that showed pancreas aplasia. According to the best of our knowledge, no case with this syndrome has presented with complete pancreatic aplasia in the literature.

Amblyopia Prevention Screening Program in Northwest Iran (Ardabil).

BACKGROUND: The aim of this study was to evaluate the results of amblyopia screening in Ardabil Province in three examination levels by kindergarten teacher, optometrist, and ophthalmologist. METHODS: In a cross-sectional study, the results of the national amblyopic prevention program in 2-6 years old children in Ardabil Province were investigated in 2012. The results pertained to the examinations of children participating in this research were collected in the national approved forms. The data were entered into the computer and were analyzed using statistical methods in SPSS 18. RESULTS: Around 38,844 children (51.7%) out of 75173 with 2-6 years old qualified children participated in the screening program in Ardabil Province. In the first stage of screening, 1068 children (33.1%) are visually impaired in one eye and 2160 children (66.9%) are visually impaired in two eyes. In the second stage, the results related to the examinations by optometrists indicated that the prevalence of refractive errors, strabismus, and others were 70%, 27.8%, and 2.2%, respectively. Refractive errors problem was most prevalent in Ardabil city (72.6%).The prevalence of refractive errors, strabismus, and other reasons in amblyopic children was 51.3%, 23.9%, and 24.8%; respectively. CONCLUSIONS: The present investigation showed that coverage of amblyopia screening program was not enough in Ardabil Province. To increase the screening accuracy, standard instruments and examination room must be used; more optometrists must be involved in this program and increasing the validity of obtained results for future programming.