Mexican consensus on breast cancer diagnosis and treatment

On this occasion, we met, now virtually, on January 29 and 30, 2021, with the purpose to review recent advances in the field of breast cancer prevention, diagnosis and treatment.Nearly 105 nation-wide renowned physicians from all institutions and specialties related to this disease were convoked and, in working groups, they analyzed the updated information of each area with the purpose to present it at plenary sessions for approval.This time, the subject "Covid and breast cancer" was added, owing to the pandemic caused by this disease and the impact it has had on patient care.It should be mentioned that 1,570 participants registered to electronically witness the consensus, out of whom 25 % were residents, 60 % from localities other than Mexico City and more than 200 participants were from Central and South America.We hope that the conclusions of this ninth revision serve as a guide for the medical community in general and for oncologists in particular, in order for them to offer patients with this disease an accurate diagnosis and an optimal and updated treatment.