Churners are those people who are about to transfer their business to a competitor or simply who cancel a subscription to a service. This paper is based on a specific business sector, which is telecommunication sector. With a churn rate of 30%, the telecommunication sector takes the first place on the list. In this paper, we present some advanced data mining methodologies which predicts customer churn in the pre-paid mobile telecommunications industry using a call detail records dataset. To implement the predictive models, we initially propose and then apply four machine learning algorithms: Random Forest, Naïve Bayes, Logistic Regression, and XG Boost. To evaluate the models, we use various evaluation metrics and find the best model which will be suitable for any class imbalanced data and also our business case. This paper can also be viewed as a comparative study on the most popular machine learning methods applied to the challenging problem of customer churn prediction.

Chest keloids often result in cosmetic disfigurement, contractures, pruritus and pain. Inflammatory truncal acne often triggers chest keloid. Management is often challenging as they are relatively resistant to treatment and recurrence rates are high. The objective of the study was to compare the clinical efficacy and safety of intralesional triamcinolone acetonide (40 mg mL−1) vs. liquid nitrogen cryotherapy vs. 595 nm pulsed dye laser in the management of chest keloids. We conducted a comparative prospective study in a total of 42 patients with chest keloids from July 2021 to July 2022. These patients were randomly divided into three treatment groups via the envelope method. The Vancouver Scar Scale (VSS) was used to assess the clinical efficacy of the treatment modality. Patients were scored at the initiation of therapy and every 4 weeks until 16 weeks. Seven patients were lost to follow-up (response rate 83%). Treatment arms consisted of intralesional triamcinolone acetonide (n = 10), liquid nitrogen cryotherapy (n = 11) and pulsed dye laser (n = 14). There was a near-equal sex distribution of chest keloids (male-to-female ratio 1.21 : 1), with 15 patients (35.7%) having additional keloids in other body parts. The mean (SD) age of patients with chest keloids was 27.2 (13.6) years with a common incidence in those aged 20–30 years. Comparison of mean VSS as baseline and at 16 weeks revealed a statistically significant decrease in the score in all three treatment arms (P < 0.05). Comparison between the three different treatment arms revealed pulsed dye laser to be the most effective modality in decreasing VSS at the 16-week follow-up (Anova followed by post hoc analysis with Tukey’s test). With regard to the adverse clinical event profile, acneiform eruptions were reported following steroid injections, blistering and depigmentation were reported following liquid nitrogen cryotherapy, and blistering was reported following pulsed dye laser therapy. Thus, the pulsed dye laser (595 nm) appears to be a safe and efficacious treatment modality in the management of chest keloids.

Cutaneous leiomyomas are benign tumors arising from smooth muscles of the skin. Multiple lesions may be arranged in segmental, zosteriform, disseminated patterns. Multiple pilar leiomyomas may be inherited in an autosomal dominant pattern and may be associated with uterine fibroids and renal cell carcinoma, also known as Reed Syndrome.

Cutaneous leiomyomas are benign tumors arising from smooth muscles of the skin. Multiple lesions may be arranged in segmental, zosteriform, disseminated patterns. Multiple pilar leiomyomas may be inherited in an autosomal dominant pattern and may be associated with uterine fibroids and renal cell carcinoma, also known as Reed Syndrome.