Cristian Suciu

Endothelial cells from hematopoietic stem cells are functionally different from those of human umbilical vein

Hematopoietic stem cells have a remarkable plastic capacity, which allows them to differentiate into various cells, such as immune cells, nervous cells, muscle cells, bone and cartilaginous cells. The aim of this study was to show the capacity of stem cells to differentiate into endothelial cells, in culture, after addition of endothelial cells growth suplement (ECGS). We also compared the behavior of these cells with that of endothelial cells obtained from human umbilical vein (HUVEC). CD34+ cells obtained by immunomagnetic separation from human umbilical cord and placental blood were used. After 12‐15 days of culture in a medium containing ECGS, the cells showed morphological changes characteristic to endothelial cells and immunocytochemical analysis revealed the presence of CD31 surface antigen and von Willebrand factor. The flow‐cytometric analysis of endothelial cells adhesion molecules (ECAM) showed that endothelial cells derived from CD34+ cells expressed CD54/ICAM‐1 9.65 ± 0.2% and CD106/VCAM 7.73±0.3%, values similar to those expressed by HUVECs. After TNF incubation, ECAM expression increased only in HUVECs. These data demonstrate that a fraction of circulating CD34+ cells may develop some endothelial cell characteristics when cultured with ECGS, but they are functionally different from HUVECs.

Semi‑automated evaluation of Ki‑67 index in invasive ductal carcinoma of the breast

A significant factor that affects the value of the Ki-67 proliferation index (IK) is the interpretation and implementation approach. This method is based on visual or automated methods to count tumor nuclei labeled with Ki-67 antigen, and is prone to errors. Detection of Ki-67 is a useful tool in breast cancer and contributes to its molecular classification. The current study proposes a method for the quantification of Ki-67-positive tumor nuclei, which allows for the determination of the exact IK value that is required for tumor stratification based on the proliferation rate. The IK was assessed in 81 successive cases of diagnosed invasive ductal breast carcinoma using a semi-automated method that accurately identifies positive tumor cell nuclei. This method prevents the inclusion of other possible positive cells, including lymphoid, normal epithelia and hyperplastic. In small specimens with increased cell density, where the nucleus/cytoplasm ratio is markedly in favor of the nucleus and the distance between nuclei is small, the method allows precise quantification of the nuclei, even when the limits between nuclei are difficult to identify. In addition, images may be stored in a database, including the assessments, and easily accessed when required. We hypothesize that the semi-automated method for counting nuclei offers the most accurate method of assessing the IK and avoids counting errors that may occur through other methods.

The reciprocal relationship between coping mechanisms and lung cancer diagnosis: findings of a prospective study

Background/purpose Lung cancer is a major stress factor for the affected individual, leading to psychological distress in over 50% of the diagnosed patients. Since coping styles describe different patterns in approaching serious problems, our study aimed at ascertaining if the diagnosis of lung cancer has an impact on the patient’s coping styles and if there is a difference in psychical response among patients with different coping styles, as assessed by variance of anxiety and depression scores after diagnosis. Patients and methods In this prospective study, a cohort of 50 patients were evaluated using the COPE scale, Generalized Anxiety Disorder Questionnaire 7 (GAD-7), and Patient Health Questionnaire-9 (PHQ-9), both prior to and 1 month after learning about their lung cancer diagnosis. The baseline and the final parameters were compared and stratified with respect to coping styles. Results We observed that 1 month after learning the diagnosis, the patients had a significantly higher GAD-7 score (median score 12 vs 4 points; p<0.001). At the same time, the PHQ-9 score was significantly higher at the 1 month follow-up time-point (median score 16 vs 7; p=0.002). The increases in the anxiety scores were significant in patients with initial social support (13 vs 3; p=0.014) and avoidance coping style (14 vs 6; p=0.003). Regarding the depression scores, after the diagnosis, the only significant increase was observed in patients with initial avoidance coping style (18 vs 5; p=0.014). Conclusion Our study demonstrates that patients who receive the diagnosis for cancer show a significant increase in anxiety and depression intensity. The most adaptive coping style turned out to be the problem-focused one while the least adaptive one was the avoidant style.