Statement: Unlike the primary trial, the secondary trial does not test Gonadotrophin-releasing Hormone Analogues or medical devices.
Primary_evidence: INTERVENTION 1:    Pecs Group   Ultrasound guided pectoral nerve block is performed right after induction, before surgery. The needle is advanced to the tissue plane between the pectoralis major and pectoralis minor muscle at the vicinity of the pectoral branch of the acromiothoracic artery, and 10 mL of 0.5% ropivacaine deposited. In a similar manner, 20 mL is deposited at the level of the third rib between the pectoralis minor muscle and the serratus anterior muscle . INTERVENTION 2:    Control Group There is no block.
Secondary_evidence: INTERVENTION 1:    Tamoxifen or Letrozole   tamoxifen or letrozole work in treating women with ductal carcinoma in situ   letrozole   tamoxifen citrate   conventional surgery   neoadjuvant therapy