Background & aim: Breast cancer entails 10% of all cancers in the world.  Among all types of cancers, 30 percent of women are infected with breast cancer. Non-coding of long RNA (lncRNA) is a new group of known genes in the human genome transcribed from large parts of the genome of eukaryotes and play an important role in the regulation of different biological processes. The aim of the present study was to compare the expression level of GAS5 lncRNA and NEAT1  in normal and neoplastic samples from breast cancer patients by RT-qPCR.

Methods: In the present case-control study, 40 samples from patients with breast cancer tumor and 40 patients from non-tumor under the direct supervision of a pathologist specialist due to clinical presentation and laboratory findings were collected. After extracting DNA from normal and tumor tissues, cDNA synthesis method according to the protocol and RT-qPCR was performed by SYBR®Premix Ex TaqTM II kit.  LncRNA expression levels of genes GAS5 and NEAT1 was calculated using ΔΔCT. Data were analyzed using t-test.

Results: The results of Real Time Reverse transcription-PCR indicated that partial expression levels of GAS5 lncRNA gene in tumor samples compared to normal GAS5 lncRNA of the gene, decreasing the expression, and the mean relative expression levels of lncRNA and NEAT1 gene in tumor samples compared to normal was overexpressed. These variation gene expression of LncRNA related to GAS5 about 1.5 times and 2 times to  lncRNA from  NEAT1 gene was observed respectively.

Conclusion: Due to the previous reports, these lncRNAs act as tumor suppressor in breast cancer and had differential expression in tumor and normal tissues, which could be used as biomarker for cancer diagnosis. Moreover, expression of these lncRNAs in different breast cancer subtypes and patient with other blood raises the importance of this molecules as a biomarker for cancer diagnosis and prognosis.

Background & aim: The high incidence and poor prognosis of the lung cancer makes it aa a major health problem in the last few decades. Determination of frequency of different histopathology types of primary lung cancer has great importance in creating integrated treatment programs and recognized the effective factors causing the disease. Overexpression of MMPs has a direct relation with invasion and metastasis of malignant tumors in different tissues. The aim of this study was to assess the effect of MMP-2 gene promoter polymorphism with lung cancer and metastases in patients with lung cancer and compared with the control groups by the PCR-RFLP method.

Methods: In the present case-control study, The MMP-2 polymorphisms were analyzed by restriction fragment-length polymorphism (RFLP) in 50 patients with lung cancer and 77 cohort sample. All samples were taken under supervision of a physician. DNA isolation was performed using DNA extraction kit (Cinnagen, Iran). MMP9 gene was amplified by specific primers and PCR product was digested with FSPBI restriction enzyme. Data were analysis using Chi square by the SPSS software.

Results: The examination of allelic and genotypic distribution in patients with lung cancer and control showed that the allele frequency of C and T in patients with lung cancer were 90 and 10% (P=0.04) and in the control were 80.15 and 30% (P=0.05) respectively. Also genotype frequency of CC, CT and TT in patients with lung cancer were 82, 16 and 2 (P=0.05) and in the control were 69.93, 31.16, 3.1 percentage respectively (P=0.5). No significant difference was seen in comparison of genotype groups in non-metastatic and control. Comparison of homozygous CC genotype and control were confirmed the direct involvement of c allele in metastasis

Conclusion: It seems that individuals with C allele can increase susceptibility to lung cancer. Also these findings indicate that CC genotype as a risk factor facilitating the spread of metastasis of lung cancer.