Statement: Only people who have previously been diagnosed with cancer and are currently receiving ongoing treatment for their primary tumor are eliglbe for the primary trial, as long as they are over the age of 20.
Primary_evidence: Inclusion Criteria:   breast cancer survivors over 20 years-old   premenopausal at the time of diagnosis   treated with operation and chemotherapy   newly developed dyspareunia after cancer treatment Exclusion Criteria:   recent (< 2 months) start or cessation of hormonal treatment (tamoxifen etc.)   depression or other psychological problems   active vaginal infection   evidence of cancer recurrence   previously use of lactate-containing lubricants   other chronic diseases which severely disturb the sexual life