IRCT20180720040533N3 IRCT 2022-12-06 Tehran University of Medical Sciences The effect of Indian ink on the identification of involved lymph nodes in breast cancer Preliminary study to evaluate the effectiveness of direct injection of Indian ink and blue methylene in the involved and suspected lymph nodes before and after neoadjuvant chemotherapy in patients with breast cancer and the practical use of this method in detecting theses lymph nodes during surgery. 2022-04-21 anticipated 20 Complete https://irct.ir/trial/62337 interventional Randomization: N/A, Blinding: Not blinded, Placebo: Not used, Assignment: Single, Purpose: Diagnostic. N/A breast cancer. Intervention group: breast cancer patients who are candidates for neoadjuvant chemotherapy. If the lymph nodes are involved , the affected lymph nodes will be injected with 0.2 cc of Indian ink under an ultrasound guide (injection is done with an insulin syringe and then 0.1 cc of distilled water is injected to clean the syringe). No - There is not a plan to make this available Justification or reason for not sharing IPD is There is no reason