Clinical responses to focused ultrasound applied to women with vulval intraepithelial neoplasia

Therapeutic effects of focused ultrasound on vulvar squamous intraepithelial lesions in rat

OBJECTIVE

In this study, we established a Sprague-Dawley rat model of vulvar squamous intraepithelial lesions and investigated the impact of focused ultrasound on the expression of hypoxia-inducible factor-1α (HIF-1α), vascular endothelial growth factor (VEGF) and mutant type p53 (mtp53) in the vulvar skin of rats with low-grade squamous intraepithelial lesions (LSIL).

MATERIALS AND METHODS

The vulvar skin of 60 rats was treated with dimethylbenzanthracene (DMBA) and mechanical irritation three times a week for 14 weeks. Rats with LSIL were randomly allocated into the experimental group or the control group. The experimental group was treated with focused ultrasound, while the control group received sham treatment.

RESULTS

After 14 weeks treatment of DMBA combined with mechanical irritation, LSIL were observed in 44 (73.33%) rats, and high-grade squamous intraepithelial lesions (HSIL) were observed in 14 (23.33%) rats. 90.91% (20/22) of rats showed normal pathology and 9.09% (2/22) of rats exhibited LSIL in the experimental group at four weeks after focused ultrasound treatment. 22.73% (5/22) of rats exhibited LSIL, 77.27% (17/22) of rats progressed to HSIL in the control group. Compared with the control-group rats, the levels of HIF-1α, VEGF and mtp53 were significantly decreased in experimental-group rats (p < 0.05).

CONCLUSIONS

These results indicate that DMBA combined with mechanical irritation can induce vulvar squamous intraepithelial lesion in SD rats. Focused ultrasound can treat LSIL safely and effectively, prevent the progression of vulvar lesions, and improve the microenvironment of vulvar tissues by decreasing the localized expression of HIF-1α, VEGF, and mtp53 in rats.

Feasibility study of focused ultrasound in the treatment of vulvar low-grade squamous intraepithelial lesions with persistent symptoms

OBJECTIVE

This study aimed to investigate the feasibility, efficacy, and safety of focused ultrasound (FUS) for the treatment of vulvar low-grade squamous intraepithelial lesions (VLSIL) with persistent symptoms.

METHODS

This retrospective analysis included 24 VLSIL patients who underwent FUS treatment. At each follow-up visit, the clinical response was assessed including changes in symptoms and signs. In addition, the histological response was assessed based on the vulvar biopsy results of the 3rd follow-up. Clinical and histological response were assessed to elucidate the efficacy.

RESULTS

A total of 22 patients completed follow-up and post-treatment pathological biopsies. After treatment, the clinical scores of itching decreased from 2.55 ± 0.51 to 0.77 ± 0.81 (p < 0.05). Furthermore, the clinical response rate and histological response rate were 86.4% and 81.8%, respectively. Only two cured patients indicated recurrence in the 3rd and 4th year during the follow-up period and achieved cure after re-treatment. In terms of adverse effects, only one patient developed ulcers after treatment, which healed after symptomatic anti-inflammatory treatment without scarring, and no other treatment complications were found in any patients. None of the patients developed a malignant transformation during the follow-up period.

CONCLUSION

This study revealed that FUS is feasible, effective, and safe for treating VLSIL patients with persistent symptoms, providing a new solution for the noninvasive treatment of symptomatic VLSIL.

C. elegans: Sensing the low-frequency profile of amplitude-modulated ultrasound

Several research groups have demonstrated that C. elegans can respond to pulsed ultrasound stimuli, and elucidating the underlying mechanisms is necessary to develop ultrasound neuromodulation. Here, amplitude-modulated (AM) ultrasound is applied to C. elegans, and its behavioral responses are investigated in detail. By loading surface acoustic waves (SAWs) onto free-moving worms on an agar surface, a carrier wave with a frequency of 8.80 MHz is selected. The signal is modulated by a rectangular or sinusoidal profile. It is demonstrated that sinusoidal modulation can produce similar responses in worms to rectangular modulation, with the strongest responses occurring at modulation frequencies of around 1.00 kHz. Meanwhile, the behavioral response is relatively weak when the ultrasonic signal is unmodulated, that is, when only the carrier wave is applied. At modulation frequencies other than 100.00 Hz to 10.00 kHz, the worms respond weakly, but when a second modulation frequency of 1.00 kHz is introduced, an improvement in response can be observed. These results suggest that C. elegans may sense the low-frequency envelope and respond to amplitude-modulated ultrasonic stimuli like an amplitude demodulator. MEC-4, an ion channel for touch sensing, is involved in the behavioral response of C. elegans to ultrasound in the present setup.

A Scoping Review of Treatment Outcome Measures for Vulvar Intraepithelial Neoplasia

OBJECTIVE

The goal of this study is to identify a list of clinician-reported outcome measures (CROMs) and patient-reported outcome measures (PROMs) through a review of published studies reporting on any therapeutic interventions for vulvar intraepithelial neoplasia (VIN).

MATERIALS AND METHODS

A systematic search of published studies reporting on any therapeutic interventions for VIN was performed on MEDLINE, Embase, Cochrane Database, PsychInfo, and CINAHL from inception to September 20, 2021, based on predetermined study selection criteria. Data were extracted and analyzed by 2 authors independently using Covidence software.

RESULTS

Thirty two of 2386 studies identified met study selection criteria. None of the 32 studies provided an explicit definition of VIN treatment "success." The most common CROM was "clinical response to treatment." The most common scale used to measure this outcome was "complete response/partial response/no response"; however, 17 of 23 studies (73.9%) did not define these values. Laboratory CROMs were reported in 12/32 (37.5%) studies. Patient-reported outcome measures were reported in only 10 of 32 studies(31.3%) -the most common PROM was "symptoms." Only 2 of 32 studies measured PROMs related to "quality of life" domains. Adverse events/treatment-related adverse effects were reported in 24 of 32 studies (75%), although 71% of studies provided no details on how these data were collected.

CONCLUSIONS

There is a large variation in outcome measures, instruments, and scales used for any clinician-reported treatment outcome such as "clinical response." Most studies do not include patient-reported outcome measures assessing quality of life domains. A Core Outcome Set for the treatment of VIN is needed to improve the quality of VIN research.

Photodynamic therapy for vulvar leukoplakia

The aim of study is to evaluate the tolerability and effectiveness of photodynamic therapy as an organ‑preserving treatment in patients with vulvar leukoplakia. 50 patients with a verifed diagnosis of «vulvar leukoplakia» were included in the study. The age varied from 27 to 74 years. The method of treatment assumed the use of the photosensitizer рhotolon (RUE «Belmedpreparaty», Belarus) administered intravenously in doses of 1.8–2.5 mg/kg. Photoirradiation of pathological foci was carried out 2.5–3 hours after intravenous injection of photolon® using a semiconductor laser «UPL PDT» (LEMT, Belarus, λ=661 nm) at exposure doses from 30 to 100 J/cm2 with a power density of 100–170 mW/cm2. The treatment was performed under medical anesthesia. The results of treatment were evaluated using clinical data. Adverse reactions and complications after the introduction of the photosensitizer and photoirradiation have not been observed. Complete clinical regression of the treated pathological foci was noted in 100% of cases with a follow‑up observation 1 month after the treatment. At follow‑up after 3 months, local recurrences of the disease were detected in 4 cases, which were successfully treated with repeated photo‑dynamic therapy sessions. The percentage of complete regressions was 92%, partial – 8%. The obtained results allow judging on the possibility of using photodynamic therapy in the treatment of patients with vulvar leukoplakia, which allows to preserve the organ and obtain a satisfactory functional and cosmetic result.