The Coevolution of Placentation and Cancer

Analogies between placentation, in particular the behavior of trophoblast cells, and cancer have been noted since the beginning of the twentieth century. To what degree these can be explained as a consequence of the evolution of placentation has been unclear. In this review, we conclude that many similarities between trophoblast and cancer cells are shared with other, phylogenetically older processes than placentation. The best candidates for cancer hallmarks that can be explained by the evolution of eutherian placenta are mechanisms of immune evasion. Another dimension of the maternal accommodation of the placenta with an impact on cancer malignancy is the evolution of endometrial invasibility. Species with lower degrees of placental invasion tend to have lower vulnerability to cancer malignancy. We finally identify several areas in which one could expect to see coevolutionary changes in placental and cancer biology but that, to our knowledge, have not been explored. Expected final online publication date for the Annual Review of Animal Biosciences, Volume 10 is February 2022. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

Surgery for Uterine Preservation in Placenta Accreta Spectrum: A Retrospective Cohort Study

Background: Owing to high risks of maternal morbidity, surgical complications, and loss of fertility, including psychological trauma caused by cesarean hysterectomy, innovative approaches for uterine preservation have been investigated. This study aimed to determine the efficacy of a novel eight-step surgical protocol for uterine preservation in placenta accreta spectrum (PAS) overlying the previous cesarean scar.Methods: We retrospectively studied consecutive patients with PAS overlying the cesarean scar, who were treated between December 2015 and October 2019 using the protocol. The depth and extension of placental invasion and severity of pelvic adhesion were assessed intraoperatively. Information regarding the gestational week at surgery, surgery duration, estimated blood loss (EBL), bladder injury, and post-procedural recovery was retrieved from the hospital database. Multiple linear regression was used to analyze factors influencing surgical blood loss. EBL was compared between the perioperative aortic balloon and non-balloon groups in severe cases using t-tests.Results: Overall, 115 patients with PAS were included. The mean EBL and surgery duration were 1666.1±1379.0 mL and 2.2±0.8 h, respectively. The uterus was successfully preserved in all patients with one surgery. Incidences of placenta accreta, increta, and percreta were 40 (35.8%), 46 (40.0%), and 29 (25.2%) cases, respectively. Extensive placental invasion and cervical involvement were observed in 41.7% and 28.7% of patients, respectively. EBL was significantly correlated with the extent of placental invasion, cervical involvement, and pelvic adhesion. No difference was seen in EBL between the balloon and non-balloon groups among the 44 patients with severe PAS.Conclusion: The eight-step protocol is effective for uterine preservation in PAS overlying the cesarean scar. EBL is affected by the extent of placental invasion, cervical involvement, and severity of pelvic adhesion. Perioperative aortic balloon should be used conservatively.

Prenatal prediction and typing of placental invasion using MRI deep and radiomic features

Background To predict placental invasion (PI) and determine the subtype according to the degree of implantation, and to help physicians develop appropriate therapeutic measures, a prenatal prediction and typing of placental invasion method using MRI deep and radiomic features were proposed. Methods The placental tissue of abdominal magnetic resonance (MR) image was segmented to form the regions of interest (ROI) using U-net. The radiomic features were subsequently extracted from ROI. Simultaneously, a deep dynamic convolution neural network (DDCNN) with codec structure was established, which was trained by an autoencoder model to extract the deep features from ROI. Finally, combining the radiomic features and deep features, a classifier based on the multi-layer perceptron model was designed. The classifier was trained to predict prenatal placental invasion as well as determine the invasion subtype. Results The experimental results show that the average accuracy, sensitivity, and specificity of the proposed method are 0.877, 0.857, and 0.954 respectively, and the area under the ROC curve (AUC) is 0.904, which outperforms the traditional radiomic based auxiliary diagnostic methods. Conclusions This work not only labeled the placental tissue of MR image in pregnant women automatically but also realized the objective evaluation of placental invasion, thus providing a new approach for the prenatal diagnosis of placental invasion.

A Case Report of Placenta Percreta

There has been an increased incidence of placenta accreta in recent decades, which is associated with an increase in cesarean delivery. A woman aged 39 years GIVP1111 at 8 months of gestation was a breech location with antepartum bleeding et. causa placenta previa totalis suspected percreta bladder infiltration and hematuria. The last abdominal ultrasound showed no visible clot retention and mild right-sided hydronephrosis (possibly a physiological condition). Due to doubts regarding the suspicion of placental invasion of the bladder, an MRI examination of the abdomen was performed. A network was irregular in shape and can not be oriented either right or left, some of which have been split. Attached to the placenta. It was not clear that the cervix and bladder were visible, the total weight was 500 grams, the size was 15x13x5 cm. Based on both macroscopic and microscopic histopathological examinations, it could be concluded that the uterus, adnexa, surgery: placenta percreta, adenomyosis uteri. Keywords: placenta percreta; uterus; antepartum bleeding