Targeting CXCR4 impaired T regulatory function through PTEN in renal cancer patients.

BACKGROUND: Tregs trafficking is controlled by CXCR4. In Renal Cell Carcinoma (RCC), the effect of the new CXCR4 antagonist, R54, was explored in peripheral blood (PB)-Tregs isolated from primary RCC patients. METHODS: PB-Tregs were isolated from 77 RCC patients and 38 healthy donors (HDs). CFSE-T effector-Tregs suppression assay, IL-35, IFN-γ, IL-10, TGF-ß1 secretion, and Nrp-1+Tregs frequency were evaluated. Tregs were characterised for CTLA-4, PD-1, CD40L, PTEN, CD25, TGF-ß1, FOXP3, DNMT1 transcriptional profile. PTEN-pAKT signalling was evaluated in the presence of R54 and/or triciribine (TCB), an AKT inhibitor. Methylation of TSDR (Treg-Specific-Demethylated-Region) was conducted. RESULTS: R54 impaired PB-RCC-Tregs function, reduced Nrp-1+Tregs frequency, the release of IL-35, IL-10, and TGF-ß1, while increased IFN-γ Teff-secretion. The CXCR4 ligand, CXCL12, recruited CD25+PTEN+Tregs in RCC while R54 significantly reduced it. IL-2/PMA activates Tregs reducing pAKT+Tregs while R54 increases it. The AKT inhibitor, TCB, prevented the increase in pAKT+Tregs R54-mediated. Moreover, R54 significantly reduced FOXP3-TSDR demethylation with DNMT1 and FOXP3 downregulation. CONCLUSION: R54 impairs Tregs function in primary RCC patients targeting PTEN/PI3K/AKT pathway, reducing TSDR demethylation and FOXP3 and DNMT1 expression. Thus, CXCR4 targeting is a strategy to inhibit Tregs activity in the RCC tumour microenvironment.

Unilateral post-chemotherapy robot-assisted retroperitoneal lymph node dissection in Stage II non-seminomatous germ cell tumor: A tertiary care experience.

Objective: Post-chemotherapy retroperitoneal lymph node dissection (PC-RPLND) represents an integral component of the management of patients with non-seminomatous germ cell tumor (NSGCT). Modified templates have been proposed to minimize the surgical morbidity of the procedure. Moreover, the implementation of robotic surgery in this setting has been explored. We report our experience with unilateral post-chemotherapy robot-assisted retroperitoneal lymph node dissection (PC-rRPLND) for clinical Stages IIA and IIB NSGCTs. Methods: A retrospective single institution review was performed including 33 patients undergoing PC-rRPLND for Stages IIA and IIB NSGCTs between January 2015 and February 2019. Following orchiectomy, patients were scheduled for chemotherapy with three cycles of bleomycin-etoposide-cisplatin. Patients with a residual tumor of <5 cm and an ipsilateral metastatic disease on pre- and post-chemotherapy CT scans were eligible for a unilateral template in absence of rising tumor markers. Descriptive statistics were provided for demographics, clinical characteristics, intraoperative and postoperative parameters. Perioperative, oncological, and functional outcomes were recorded. Results: Overall, 7 (21.2%) patients exhibited necrosis or fibrosis; 14 (42.4%) had mature teratoma; and 12 (36.4%) had viable tumor at final histology. The median lymph node size at surgery was 25 (interquartile range [IQR] 21-36) mm. Median operative time was 180 (IQR 165-215) min and no major postoperative complications were observed. Anterograde ejaculation was preserved in 75.8% of patients. Median follow-up was 26 (IQR 19-30) months and a total of three recurrences were recorded. Conclusion: PC-rRPLND is a reliable and technically reproducible procedure with safe oncological outcomes and acceptable postoperative ejaculatory function in well selected patients with NSGCTs.

Malignant melanoma of the vagina: report of two cases and review of the literature.

Vaginal melanoma (VM) is a rare disease comprising <1% of all melanomas among women, and about 3% of all vaginal malignancies. Patients experience a poor prognosis, showing <15% 5-year survival. The report concerns two premenopausal patients with VM treated by surgery with radical intent. The first patient presented with a large lesion also infiltrating the proximal paracolpium and the bladder. The second patient had a persistent lesion of the lower third of the vagina. However, in the absence of any evidence-based guidelines or even clear suggestions from the literature, it is reasonable to believe that an appropriate management of primary malignant VM should address the radical tumor resection with wide tumor-free surgical margins and symptom relief.

Targeting CXCR4 reverts the suppressive activity of T-regulatory cells in renal cancer.

With the intent to identify biomarkers in renal cell carcinoma (RCC) the functional status of T-regulatory cells (Tregs) was investigated in primary RCC. Tregs were isolated from tumoral-(TT), peritumoral tissue-(PT) and peripheral blood-(PB) of 42 primary RCC patients and function evaluated through effector T cells (Teff) proliferation, cytokines release and demethylation of Treg Specific Region (TSDR). The highest value of Tregs was detected in TT with the uppermost amount of effector-Tregs-(CD4+CD25hiFOXP3hiCD45RA-). PB-RCC Tregs efficiently suppress Teff proliferation compared to healthy donor (HD)-Tregs and, at the intrapatient evaluation, TT-derived Tregs were the most suppressive. Higher demethylation TSDR was detected in TT- and PB-RCC Tregs vs HD-Tregs (P <0,001). CXCR4 is highly expressed on Tregs, thus we wished to modulate Tregs function through CXCR4 inhibition. CXCR4 antagonism, elicited by a new peptidic antagonist, Peptide-R29, efficiently reversed Tregs suppression of Teff proliferation. Thus Tregs functional evaluation precisely reflects Tregs status and may be a reliable biomarker of tumoral immune response. In addition, treatment with CXCR4 antagonist, impairing Tregs function, could improve the anticancer immune response, in combination with conventional therapy and/or immunotherapy such as checkpoints inhibitors.