Abstract 2845: PpIX synthesis increases PDT resistant cells due to the modulating effect of EGCG on the heme synthesis pathway

Introduction: Photodynamic therapy (PDT) is a treatment for non melanoma skin cancer. PDT kills cells through reactive oxygen species (ROS), produced by interaction between cellular O2 and an excited photosensitizer (PS) by a specific light. One of the most used PS in dermatology is Protoporphyrin IX (PpIX) and its precursor methyl aminolevulinate (MAL). MAL enters into cells and is converted to PpIX by enzymes of the heme group synthesis pathway. The insertion of ferrous iron into PpIX forms a heme molecule, which has no PS action. A previous study shows that efficacy of PDT, in resistant cells, can be improved by addition of epigallocatechin gallate (EGCG), a green tea polyphenol. Therefore, the aim of this work is to evaluate the rol of EGCG on PPIX synthesis.

Material and methods: It was used a A-431 cell line from skin squamous cell carcinoma. The EC50 of EGCG was determined by MTT assay after 24 hours. Clonogenic assay was carried out using EGCG 10, 20 and 40 μM, for 4 and 24 hours of incubation. To evaluate PpIX and ROS, A-431 cells were exposed to EGCG (10, 20, 40 μM) with or without MAL 2 mM. After 4 hours, some plates were irradiated with red light to generate ROS. PpIX and ROS were detected by flow cytometry. Gene expression of enzymes of heme synthesis was analyzed by RT-qPCR. Intracellular iron was measured using a commercial kit. 

Results: EC50 determined a concentration of 50 μM of EGCG at 24 hours. EGCG concentrations from 10 μM reduced cell clonogenic capacity, even with only 4 hours of incubation. A-431 cells show PDT resistance with MAL 2 mM and a fluence of 4 J/cm2. The addition of EGCG to MAL-PDT showed a decrement of cell viability with an increase of PpIX and ROS. Besides, incubation with EGCG for 4 hours, triggered an increment of HMBS enzyme and decrease of FECH. In addition, EGCG reduced intracellular iron concentrations.

Conclusion: These findings show that EGCG has a PDT enhancing effect, decreasing intracellular iron levels and modulating gene expression of heme synthesis enzymes, which are directly related with high levels of PpIX production and ROS levels, causing the death of resistant cells.Acknowledgements: Postdoctoral FONDECYT Nº 3210618, IDeA I+D FONDEF ID21I10027

Citation Format: Daniela León, Álvaro Gutiérrez, Helga Weber, Ramón Silva, María Elena Reyes, Tamara Viscarra, Kurt Buchegger, Carmen Ili, Priscilla Brebi. PpIX synthesis increases PDT resistant cells due to the modulating effect of EGCG on the heme synthesis pathway [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2023; Part 1 (Regular and Invited Abstracts); 2023 Apr 14-19; Orlando, FL. Philadelphia (PA): AACR; Cancer Res 2023;83(7_Suppl):Abstract nr 2845.

Landscape of Genome-Wide DNA Methylation of Colorectal Cancer Metastasis

Colorectal cancer is a heterogeneous disease caused by both genetic and epigenetics factors. Analysing DNA methylation changes occurring during colorectal cancer progression and metastasis formation is crucial for the identification of novel epigenetic markers of patient prognosis. Genome-wide methylation sequencing of paired samples of colon (normal adjacent, primary tumour and lymph node metastasis) showed global hypomethylation and CpG island (CGI) hypermethylation of primary tumours compared to normal. In metastasis we observed high global and non-CGI regions methylation, but lower CGI methylation, compared to primary tumours. Gene ontology analysis showed shared biological processes between hypermethylated CGIs in metastasis and primary tumours. After complementary analysis with The Cancer Genome Atlas (TCGA) cohort, FIGN, HTRA3, BDNF, HCN4 and STAC2 genes were found associated with poor survival. We mapped the methylation landscape of colon normal tissues, primary tumours and lymph node metastasis, being capable of identified methylation changes throughout the genome. Furthermore, we found five genes with potential for methylation biomarkers of poor prognosis in colorectal cancer patients.

Phylogenetic dating analysis of HTLV-1 from Chile suggests transmissions events related to ancient migrations and contemporary expansion

Human T-cell lymphotropic virus type 1 (HTLV-1) is a globally-spread virus. It is estimated that there are about 5–10 million infected people in the world. HTLV is endemic in Chile, with higher seroprevalence among indigenous people. However, little is known about HTLV-1 genetic diversity, its introduction and dispersion in this country. To gain insights into these issues, a phylogenetic dating analysis was conducted based on Chilean and closed related long terminal repeat sequences. The time tree reconstruction showed that the introduction of HTLV-1aA occurred several times in Chile. It was hypothesized that these introductions took place at least in two different historical moments: (i) during the ancient human migrations and (ii) during/after the European colonization of South America. The present study contributes toward understanding the evolutionary history of HTLV-1 in Chile and South America.

Epigallocatechin Gallate Enhances MAL-PDT Cytotoxic Effect on PDT-Resistant Skin Cancer Squamous Cells

Photodynamic therapy (PDT) has been used to treat certain types of non-melanoma skin cancer with promising results. However, some skin lesions have not fully responded to this treatment, suggesting a potential PDT-resistant phenotype. Therefore, novel therapeutic alternatives must be identified that improve PDT in resistant skin cancer. In this study, we analyzed the cell viability, intracellular protoporphyrin IX (PpIX) content and subcellular localization, proliferation profile, cell death, reactive oxygen species (ROS) detection and relative gene expression in PDT-resistant HSC-1 cells. PDT-resistant HSC-1 cells show a low quantity of protoporphyrin IX and low levels of ROS, and thus a low rate of death cell. Furthermore, the resistant phenotype showed a downregulation of HSPB1, SLC15A2, FECH, SOD2 and an upregulation of HMBS and BIRC5 genes. On the other hand, epigallocatechin gallate catechin enhanced the MAL-PDT effect, increasing levels of protoporphyrin IX and ROS, and killing 100% of resistant cells. The resistant MAL-PDT model of skin cancer squamous cells (HSC-1) is a reliable and useful tool to understand PDT cytotoxicity and cellular response. These resistant cells were successfully sensitized with epigallocatechin gallate catechin. The in vitro epigallocatechin gallate catechin effect as an enhancer of MAL-PDT in resistant cells is promising in the treatment of difficult skin cancer lesions.

Functional and transcriptomic characterization of cisplatin-resistant AGS and MKN-28 gastric cancer cell lines

Gastric cancer (GC) is a significant cancer-related cause of death worldwide. The most used chemotherapeutic regimen in GC is based on platinum drugs such as cisplatin (CDDP). However, CDDP resistance reduces advanced GC survival. In vitro drug-resistant cell model would help in the understanding of molecular mechanisms underlying this drug-resistance phenomenon. The aim of this study was to characterize new models of CDDP-resistant GC cell lines (AGS R-CDDP and MKN-28 R-CDDP) obtained through a stepwise increasing drug doses method, in order to understand the molecular mechanisms underlying chemoresistance as well as identify new therapeutic targets for the treatment of GC. Cell viability assays, cell death assays and the expression of resistance molecular markers confirmed that AGS R-CDDP and MKN-28 R-CDDP are reliable CDDP-resistant models. RNA-seq and bioinformatics analyses identified a total of 189 DEGs, including 178 up-regulated genes and 11 down-regulated genes, associated mainly to molecular functions involved in CDDP-resistance. DEGs were enriched in 23 metabolic pathways, among which the most enriched was the inflammation mediated by chemokine and cytokine signaling pathway. Finally, the higher mRNA expression of SERPINA1, BTC and CCL5, three up-regulated DEGs associated to CDDP resistance found by RNA-seq analysis was confirmed. In summary, this study showed that AGS R-CDDP and MKN-28 R-CDDP are reliable models of CDDP resistance because resemble many of resistant phenotype in GC, being also useful to assess potential therapeutic targets for the treatment of gastric cancers resistant to CDDP. In addition, we identified several DEGs associated with molecular functions such as binding, catalytic activity, transcription regulator activity and transporter activity, as well as signaling pathways associated with inflammation process, which could be involved in the development of CDDP resistance in GC. Further studies are necessary to clarify the role of inflammatory processes in GC resistant to CDDP and these models could be useful for these purposes.

Functional and transcriptomic characterization of carboplatin-resistant A2780 ovarian cancer cell line

Background

Ovarian cancer is a significant cancer-related cause of death in women worldwide. The most used chemotherapeutic regimen is based on carboplatin (CBDCA). However, CBDCA resistance is the main obstacle to a better prognosis. An in vitro drug-resistant cell model would help in the understanding of molecular mechanisms underlying this drug-resistance phenomenon. The aim of this study was to characterize cellular and molecular changes of induced CBDCA-resistant ovarian cancer cell line A2780.

Methods

The cell selection strategy used in this study was a dose-per-pulse method using a concentration of 100 μM for 2 h. Once 20 cycles of exposure to the drug were completed, the cell cultures showed a resistant phenotype. Then, the ovarian cancer cell line A2780 was grown with 100 μM of CBDCA (CBDCA-resistant cells) or without CBDCA (parental cells). After, a drug sensitivity assay, morphological analyses, cell death assays and a RNA-seq analysis were performed in CBDCA-resistant A2780 cells.

Results

Microscopy on both parental and CBDCA-resistant A2780 cells showed similar characteristics in morphology and F-actin distribution within cells. In cell-death assays, parental A2780 cells showed a significant increase in phosphatidylserine translocation and caspase-3/7 cleavage compared to CBDCA-resistant A2780 cells (P < 0.05 and P < 0.005, respectively). Cell viability in parental A2780 cells was significantly decreased compared to CBDCA-resistant A2780 cells (P < 0.0005). The RNA-seq analysis showed 156 differentially expressed genes (DEGs) associated mainly to molecular functions.

Conclusion

CBDCA-resistant A2780 ovarian cancer cells is a reliable model of CBDCA resistance that shows several DEGs involved in molecular functions such as transmembrane activity, protein binding to cell surface receptor and catalytic activity. Also, we found that the Wnt/β-catenin and integrin signaling pathway are the main metabolic pathway dysregulated in CBDCA-resistant A2780 cells.

Electronic supplementary material

The online version of this article (10.1186/s40659-019-0220-0) contains supplementary material, which is available to authorized users.

Detection and genotyping of human papillomavirus virus (HPV): a comparative analysis of clinical performance in cervical and urine samples in Chilean women

Human papillomavirus (HPV) is the most common sexually transmitted infectious agent and is the main cause of cervical cancer (CC). In Chile, CC is the second leading cause of death by cancer in women aged 20-44 years, four times higher than in developed countries. Currently, the detection of HPV infection using a cervical brush is recommended; however, this is an invasive procedure that many women try to avoid. The aim of this study was to evaluate the clinical performance of a self-collected, urine-based HPV detection method using conventional PCR followed by a reverse line blot. A PCR-based HPV genotyping was performed on 190 paired cervical and urine samples from gynecological exams at public health centers in the Araucania Region, Chile. HPV DNA detection and genotyping were performed by PCR and reverse line blot assay. Carcinogenic HPV types were present in 64.7% and 65.8% of the cervical and urine samples; the infection rates of HPV16 were 34.7% and 33.2%, respectively. The overall percent agreement between carcinogenic HPV detection in cervical and urine samples was 73.7%, with a moderate concordance rate of carcinogenic HPV detection (kappa = 0.42). Clinical sensitivities for cervical and urine-based sampling methods to diagnose cervical intraepithelial neoplasia 2/3 (CIN2/3) by histology were 93.4% and 90.2%, respectively. These results suggest that both cervical brush and urine-based sampling show a good clinical performance in the detection of HPV infection. The urine-based sampling method represents a valuable alternative with a great impact on public health, allowing increased cervical cancer screening coverage among women who do not undergo pelvic examinations.

Abstract B29: ZNF516 a potential tumor suppressor gene candidate is implied in tumor progression in cervical cancer

Background: In Cervical Cancer (CC) the role of HPV is fundamental; however, not all HPV infected women will develop this disease. Therefore, other mechanisms, such as silencing of tumor suppressor genes (TSG), could be implied in cervical carcinogenesis. In a previous study, we constructed methylation microarrays, where we found promoter aberrant hypermethylation of ZNF516 gen in CC, postulating it as TSG candidate. The aim of this study was to characterizer ZNF516 role in cervical carcinogenesis and cell cycle.

Materials and methods: ECT1 E6/E7 (immortalized normal squamous epithelia cell line) and three CC cell lines: SiHa, C-4I and C-33A were cultivated for experiments. ZNF516 expression was determined by qRT-PCR and western blot. Treatment with 10 μM 5-aza-2′deoxycytidine (5- aza) was performed to evaluate a possible epigenetic regulation. Transfection with pCMV6-ZNF516-GFP (ZNF516) and pCMV6-GFP (Empty) was carried out in C-33A cell line through lipofection followed by G418 selection to obtain stable transfection. Viability and clonogenic assay was performed to evaluate transfected cell behaviour. Also, immnunohistochemical analysis was performed in 509 cervical biopsy tissues (55 normal; 188 low-squamous intraepithelial lesions; 205 high- squamous intraepithelial lesions and 57 squamous cervical cancers).

Results: ZNF516 mRNA expression was significantly downregulated in SiHa (p&lt;0.01) and C-33A (p&lt;0.001) respect to ECT1 E6/E7. Western blot showed a deregulated protein expression of ZNF516 in all CC cell lines. After treatment with 5-aza, mRNA (p&lt;0.05) and protein expression of ZNF516 of all CC cell lines were restored. ZNF516 transfected C-33A showed a significant colony formation (p&lt;0.01) and viability (p&lt;0.01) decrease compared with C-33A transfected with the empty vector. Nuclear expression of ZNF516 in cervical biopsies showed a diminished expression in SCC respect to normal epithelia (p&lt;0.001)

Conclusions: There is a clear ZNF516 dysregulation in CC cell lines, and the inactivation mechanism seem to be methylation. Restored expression of ZNF516 in C-33A cell line modifies the tumor phenotype, decreasing cellular viability and colony formation. These results suggest that ZNF516 could be a TSG, and its inactivation promotes CC developing.

Citation Format: Carmen Gloria Ili, Tamara Viscarra, Juan Carlos Araya, Jaime Lopez, Barbara Mora, Javier Retamal, Enrique Bellolio, Susana Aedo, Juan Carlos Roa, Priscilla Brebi. ZNF516 a potential tumor suppressor gene candidate is implied in tumor progression in cervical cancer. [abstract]. In: Proceedings of the AACR Precision Medicine Series: Cancer Cell Cycle - Tumor Progression and Therapeutic Response; Feb 28-Mar 2, 2016; Orlando, FL. Philadelphia (PA): AACR; Mol Cancer Res 2016;14(11_Suppl):Abstract nr B29.

Abstract A31: Reprimo, a potential tumor suppressor gene TP53-dependent, modulates negatively cell migration and invasion in the MDA-MB-231 breast cancer cell line

Background: Reprimo, a highly glycosylated protein, is a new downstream effector of p53-induced cell cycle arrest at the G2/M checkpoint, and a putative tumor suppressor gene frequently silenced via methylation of its promoter region in several malignances. The aim of this study was to characterize the epigenetic inactivation and its biological function in BC cell lines.

Methods: The correlation between Reprimo methylation and loss of mRNA expression was assessed in six breast cancer cell lines by methylation specific PCR (MSP), 5-Aza-2′-deoxycytidine treatment and qRT-PCR assays. MDA-MB-231 cells were chosen to investigate the phenotypic effect of Reprimo in cell proliferation, cell cycle, cell death, cell migration and invasion.

Results: In the cancer methylome system (CMS) (web-based system for visualizing and analyzing genome-wide methylation data of human cancers), the CpG island region of RPRM (1,1Kb) was hypermethylated in breast cancer compared to normal breast tissue. Downregulation of RPRM mRNA by methylation was confirmed in MDA-MB-231 and BT-20 cell lines. In addition, overexpression of RPRM in MDA-MB-231 cells resulted in decreased rates of cell migration, wound healing and invasion in vitro (P &lt; 0.0001). However, RPRM overexpression did not alter cell viability, rate of death cell and G2/M cell cycle transition in this biological model.

Conclusion: Taken together, these data suggest that RPRM is involved in decreased cell migration and invasion in vitro, acting as a potential tumor suppressor gene in the MDA-MB-231 cell line.

Citation Format: Kurt Buchegger, Tamara Viscarra, Carmen Gloria Ili, Ismael Riquelme, Pablo Letelier, Alejandro Corvalan, Priscilla Brebi, Tim Hui-Ming Huang, Juan Carlos Roa. Reprimo, a potential tumor suppressor gene TP53-dependent, modulates negatively cell migration and invasion in the MDA-MB-231 breast cancer cell line. [abstract]. In: Proceedings of the AACR Precision Medicine Series: Cancer Cell Cycle - Tumor Progression and Therapeutic Response; Feb 28-Mar 2, 2016; Orlando, FL. Philadelphia (PA): AACR; Mol Cancer Res 2016;14(11_Suppl):Abstract nr A31.

Evaluation of ZAR1 and SFRP4 methylation status as potentials biomarkers for diagnosis in cervical cancer: exploratory study phase I

CONTEXT

Aberrant hypermethylation of promoter region of tumor suppressor genes could be used as cancer biomarkers.

OBJECTIVE

To test methylation status of ZAR1 and SFRP4 promoter regions as potentials biomarkers for diagnosis of preneoplastic and neoplastic lesions of cervix.

MATERIALS AND METHODS

Cytobrush samples were evaluated by Methylation specific PCR (MSP) and quantitative MSP (qMSP).

RESULTS

ZAR1 and SFRP4 methylation frequency increased as the grade of lesion increased and the differences between normal and cervical cancer (CC) are statistically significant (p < 0.0001). qMSP showed higher ZAR1 and SFRP4 methylation levels in cancer than normal epithelia (p < 0.001) and preneoplastics lesions (p < 0.01).

DISCUSSION

qMSP quantify methylation levels and have high sensitivity and specificity.

CONCLUSION

ZAR1 and SFRP4 qMSP could be used as potential biomarker for CC diagnosis.

Abstract 2956: c-FLIP (L) dual function in cervical cancer

Cellular FLICE-like inhibitory protein (c-FLIP) is a caspasa-8/10 homolog catalytically inactive that interferes with the efficient formation of DISC. There are three isoforms of this protein: c-FLIPL (long) of 55kDa, c-FLIPS (short) of 26kDa y c-FLIPR (Raji) of 24kDa. c-FLIPS and c-FLIPR functions have been well established: both can block extrinsic pathway of apoptosis by inhibiting procaspasa-8 activation in DISC. However, c-FLIPL function still remains unclear. When c-FLIPL is overexpressed, as in some cancers, has an anti-apoptotic function very similar to c-FLIPS, but also can be a proapoptotic molecule at low concentrations. The aim of this study is to characterize c-FLIP functions in cervical uterine carcinogenesis.

Three cervical cancer cell lines were used in this study: SiHa, C-4I and C-33A. c-FLIP expression in cell lines was determined by real time PCR and western blottting. c-FLIP expression was transiently downregulated by siRNA and the silencing effects on cell viability, proliferation and apoptosis were analysed, by comparing with a control negative siRNA-transfected cells.

Using MTS analysis, SiHa and C4I c-FLIP transfected cells showed a increment of viability compared with scramble, since 24 hours after transfection in C 4I and 72 hours in SiHa (P&lt;0.05), while C-33A cells do not show differences. Ki-67 immunocitochemestry was performed to evaluate proliferation in cervical cell lines. Statistical differences were found between SiHa and C 4I c-FLIP transfected cells compared with scramble (P&lt;0.05). All three c-FLIP transfected cell lines showed a higher level of apoptosis than scramble control (P&lt;0.05), using a TUNEL-based analyzed performed by flow cytometry.

Our results suggest that c-FLIPL could be having a dual function in cervical cancer cell lines, both inhibiting proliferation and apoptosis.

Grant Support: This investigation was financed by Proyect CORFO-INNOVA N°07CN13PBT-222 and Proyect CORFO N° 09CN14-5960 (CEGIN). CI is recipient of grants from FONDECYT Postdoctoral Proyect N° 3130630. PB is recipient of grants from FONDECYT Postdoctoral Proyect N° 3120141

Citation Format: Carmen G. Ili, Priscilla Brebi, Alejandra Andana, Patricia Garcia, Pamela Leal, Oscar Tapia, Tamara Viscarra, Helga Weber, Juan Roa. c-FLIP (L) dual function in cervical cancer. [abstract]. In: Proceedings of the 104th Annual Meeting of the American Association for Cancer Research; 2013 Apr 6-10; Washington, DC. Philadelphia (PA): AACR; Cancer Res 2013;73(8 Suppl):Abstract nr 2956. doi:10.1158/1538-7445.AM2013-2956

Note: This abstract was not presented at the AACR Annual Meeting 2013 because the presenter was unable to attend.

Abstract 647: Novel promoter hypermethylation marker for prognostic in cervicouterine cancinogenesis

New biomarkers are needed to improve cervical cancer screening technologies, which are mostly based on cytological examination and HPV detection. However, PAP-smear has a low-sensitivity to detect low grade squamous intraepithelial lesions and not all HPV infected women will develop preneoplastic or neoplastic lesions. Previous results of our group showed that genes Gen Z (patent pending), CDH1 and MEGF9 could be hypermethylated in cervical cancer and not in normal epithelia. The aim of this study was to determinate if promoter methylation status of genes (Gen Z, CDH1 and MEGF9) are related with progression or diagnosis of cervical carcinogenesis.

For this study, 107 citobrush, urine and blood samples were collected from women who attended to gynecological care in a public health center in Temuco, Chile. Citobrush DNA from 50 normal, 40 low grade squamous intraepithelial lesion (LSIL), 40 high grade squamous intraepithelial lesion (HSIL) and 17 squamous cervical cancer were bisulfite converted for methylation specific PCR (MSP). Bisulfite conversion was confirmed by amplification of a 133-bp fragment of the β-actin. MSP primers were specifically design for CpG island of promotor region of each gene.

Gen Z was found 100% methylated in SCC samples, 65% in HSIL, 43% in LSIL and in normal samples only a 26%. MEGF9 and CDH1 genes were found methylated in 36% and 48% of normal samples, 45% and 55% of LSIL, 70% and 77% of HSIL and 47% and 71% of SCC, respectively.

All promoter regions studied showed a higher methylation frequency in LSIL, HSIL and SCC than normal samples. Significant statistical differences in Gen Z and CDH1 Methylation frequencies between normal and SCC samples were found (P&lt;0.05). Methylation of Gen Z increased in a sequential and cumulative way as the lesion progress.

Our results suggest that the Gen Z could be useful tool for identifying women with a higher risk of progression to cervical cancer. Examination of these biomarkers in a larger, independent cohort is warranted. Grant Support: This investigation was financed by Proyect CORFO-INNOVA N°07CN13PBT-222 and Proyect CORFO N° 09CN14-5960 (CEGIN). CI is recipient of grants from FONDECYT Postdoctoral Proyect N° 3130630. PB is recipient of grants from FONDECYT Postdoctoral Proyect N° 3120141

Citation Format: Priscilla Brebi, Alejandra Andana, Rene Hoffstetter, Carmen Ili, Tamara Viscarra, Ramon Silva, Patricia Garcia, Pamela Leal, Helga Weber, Juan C. Roa. Novel promoter hypermethylation marker for prognostic in cervicouterine cancinogenesis. [abstract]. In: Proceedings of the 104th Annual Meeting of the American Association for Cancer Research; 2013 Apr 6-10; Washington, DC. Philadelphia (PA): AACR; Cancer Res 2013;73(8 Suppl):Abstract nr 647. doi:10.1158/1538-7445.AM2013-647

Abstract 4789: Human papillomavirus genotyping in urine samples of women with squamous intraepithelial lesions of cervix

Human papillomavirus (HPV) is the most frequent microorganism sexually transmitted and is the causal agent of cervical carcinoma were it could be found in 99.7% of cases. The detection of HPV en women with or without lesions of cervix is generally performed in biopsies and cytobrush, which are invasive samples; therefore many patients do not attend to health care to get HPV test. The aim of this study was to develop a technique capable of detect and genotype HPV in urine samples of women with squamous intraepithelial lesions of cervix.

For this study, 87 urine samples from patients with normal epithelia of cervix (25), low grade squamous intraepithelial lesion (LSIL) (24), high grade squamous intraepithelial lesion (HSIL) (38) were collected from women who attended to gynecological care in a public health center in Temuco, Chile. DNA extraction was performed with a manual method. For protein precipitation, Phenol-Chloroform and ammonium acetate were used. DNA precipitation was performed with absolute ethanol. HPV detection and genotyping was performed with the kit HPV Typing (patent pending) which is capable of detect 18 more frequent HPV types and beta globin gen as control of DNA integrity.

20% of urines from normal epithelia women were positive for HPV. Three genotypes were found in normal samples: HPV52, HPV42 and HPV53. LSIL there was a 92% of HPV positivity and the most frequent genotypes were HPV16 and HPV18. In HSIL, 95% of urine sample were positive for HPV. HPV16, HPV18 and HPV31 were the most frequent genotypes in HSIL. Genotypes found in urine samples were similar to world reports.

Using the DNA extraction described before and HPV easy typing kit it is possible to detect and genotype HPV in urine samples. These results suggest that is possible a HPV primary screening test in non-invasive sample, complementing PAP smear in order to determinate which women have a higher risk of developing preneoplastic and neoplastics lesions.

Grant Support: Proyect CORFO N° 09CN14-5960 (CEGIN). CI is recipient of grants from FONDECYT Postdoctoral Proyect N° 3130630. PB is recipient of grants from FONDECYT Postdoctoral Proyect N° 3120141.

Citation Format: Tamara Viscarra, Alejandra Andana, Priscilla Brebi, Doris Menzel, Carmen G. Ili, Ramon Silva, Juan C. Roa, Raul Sanchez. Human papillomavirus genotyping in urine samples of women with squamous intraepithelial lesions of cervix. [abstract]. In: Proceedings of the 104th Annual Meeting of the American Association for Cancer Research; 2013 Apr 6-10; Washington, DC. Philadelphia (PA): AACR; Cancer Res 2013;73(8 Suppl):Abstract nr 4789. doi:10.1158/1538-7445.AM2013-4789