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International audience; 5548 Background: Ovarian cancer is the leading cause of death by gynecological cancer. Complete surgery remains one of the main prognostic factors. Laparoscopic exploration is mandatory to assess surgical resectability at diagnosis or after neoadjuvant chemotherapy. However, there is no clinical or biological marker that can correctly predict resectability and may be able to avoid a second laparoscopic exploration for initially unresectable diseases. Our aim was to assess circulating tumor DNA (ctDNA) value as a predictive non-invasive marker of evolution towards resectability for patients with epithelial ovarian cancer receiving first-line chemotherapy. Methods: We explored in this work one of the secondary objectives of the CIDOC study (NCT03302884). CIDOC is a multicenter prospective study aiming to explore ctDNA value as early marker of disease relapse after first-line treatment for epithelial ovarian cancer. Patients with mucinous histology or early stages not requiring chemotherapy are excluded. Plasma samples are collected at diagnosis, during neoadjuvant chemotherapy, and during follow-up. After DNA extraction, panel-based next generation sequencing is performed on both tumor samples and germline DNA, and somatic mutations of interest are selected for ctDNA monitoring. ctDNA analyses are conducted using droplet digital PCR (BioRad QX200) by measuring the variant allele fraction (VAF) of previously identified mutations. Results: This intermediary analysis has included 47 patients diagnosed between March 2017 and December 2019. Median age was 69 years old (48 – 84). Most of the patients had advanced disease (89.4% stage FIGO III or IV), serous histology (94.8%), and high grade tumor (92.3%). Most of the patients underwent complete interval cytoreductive surgery (76.3% vs 17.4% complete upfront surgery). Most of the tumors had TP53 mutations (85.1%), following by alterations involving DNA repair genes (38.3%). Median cell-free DNA concentration at baseline was 0.38 ng/µL (0 – 12.8). ctDNA was identified in 92.1% of patients at baseline with a median VAF of 1.84% (0 – 42.52%). ctDNA VAF was correlated to the peritoneal dissemination ( p= 0.039) assessed with the peritoneal cancer index. ctDNA clearance after preoperative chemotherapy tended to be correlated to achievement of complete interval surgery for patients receiving neoadjuvant chemotherapy ( p= 0.108). Conclusions: ctDNA may be a promising non-invasive marker to assess peritoneal cancer spreading and to predict surgical resectability after neoadjuvant chemotherapy. If confirmed in larger populations, this may enable to avoid additional surgical explorations for patients who remain ctDNA positive after chemotherapy. Clinical trial information: NCT03302884.

Del 7 de diciembre de 1999 al 30 de abril de 2003 realizamos histerectomía total por laparoscopia (tipo IV - E) en 202 pacientes. La edad promedio fue de 46 años, el tiempo quirúrgico promedio de 100 minutos y el peso uterino promedio de 170 gramos. Los tres principales diagnósticos prequirúrgicos fueron miomatosis uterina (51%), lesión escamosa intraepitelial de alto grado (21%) y dolor pélvico crónico (9%). El principal diagnóstico patológico fue miomatosis y/o adenomiosis uterina en el 79,2% de los casos (160 pacientes). Se presentaron complicaciones en 16 pacientes (7,9%); de estas, cinco (2,5%) fueron infecciosas, cuatro (2%) hemorrágicas, tres (1,5%) vesicales y otras complicaciones en cuatro pacientes (2%). No se evidenciaron complicaciones ureterales, vasculares ni intestinales. Se propone la histerectomía total por laparoscopia como primera opción quirúrgica en unidades con suficiente experiencia en cirugía laparoscópica. Total laparoscopic hysterectomy (type IV - E) was performed in 202 patients from December 7/1999 to April 30/2003. The average age was 46 years, the average surgical time was 100 minutes, and the mean uterine weight was 170 grs. The three leading clinical diagnosis were uterine leiomyomas (51%), high level cervical squamous intraepithelial lesions (21%), and chronic pelvic pain (9%). The main pathological diagnosis was uterine leiomyomas with or without uterine adenomyosis in 79,2% of the cases (160 patients). There were complications in 16 patients (7,9%): 5 patients (2,5%) with infection, 4 patients (2%) with hemorrhagic complication, 3 with bladder trauma (1,5%) and 4 with other complications (2%). We did not have any ureteral, vascular or intestinal complications. We recommend total laparoscopic hysterectomy as the first surgical choice in surgical units with adequate experience in laparoscopic surgery.