PASSION - P Trial: Ph Adjusted Sulfur-Colloid, Sentinel Initiative ON Pain Trial

Null hypothesis: There is no difference in overall pain intensity between standard and pH adjusted radiocolloid for patients undergoing sentinel lymph node mapping and biopsy for breast cancer. Objectives and scientific aims: To compare the intensity of pain (Wong-Baker FACES Pain Rating Scale + McGill Pain Questionnaire) associated with WRAMC's current standard and pH-adjusted radiocolloid for patients undergoing sentinel lymph node mapping and biopsy for breast cancer. To assess objectively physician appraisal of patient pain during the radiocolloid injection and compare physician interpreted pain score with patient reported pain score. Define the success rate of intra-operative SLN identification for each study group.