No Significant Association Between Herpes Zoster and Breast Cancer: A German Outpatient Study with over 120,000 Participants.

Purpose: The purpose of this study was to investigate a possible association between Herpes Zoster (HZ) and the subsequent diagnosis of breast cancer (BC).

Methods: Utilizing the Disease Analyzer database, anonymized medical records from German office-based practices were accessed. Longitudinal data of female patients aged 18 years and above diagnosed with HZ between 2005 and 2021 were included.

Is there an association between mastitis and breast cancer? a retrospective cohort study from Germany.

Purpose: The aim of the study was to explore the association between mastitis and subsequent breast cancer.

Methods: This retrospective cohort study included women aged ≥ 18 years with an initial mastitis diagnosis from 315 office-based gynecologists in Germany between January 2005 and December 2021. Women without mastitis were matched to women with mastitis using propensity score matching based on age, index year, average yearly consultation frequency during the follow-up period, and coexisting diseases such as obesity, benign mammary dysplasia, hypertrophy of the breast, unspecified lump of breast, and other disorders of the breast.