Study population All of patients will undergo partial mastectomy. 140 patients will be enrolled.
Intervention Pectoralis nerve block will be performed in the Block group.
Psychosocial factor screening Pain-detect, HADS, EQ-5D, PHQ-15 (somatic symptom), PCS (pain catastrophizing), BFI (big five inventory), HAM-A\&D, Pressure algometry (Pain sensitivity), Quantitative sensory test (pinprick)
Study endpoints Quality of recovery (QoR)-15 Pain visual analogue scale Opioid consumption Breast Cancer Pain Questionnaire (BCPQ)
