My sister is 32 year old, she was diagnosed with low grade dcis in Feb 2016. Her lump was on the breast which was removed surgically. She also took 4 chemo and 31 days radiation. She successfully completed her treatment. Then Dr. Prescribed her tamoxifen meds. Her entire treatment ended in august 2016. Now just few days back (20th oct 2016) she got another lump on the same breast, on 8th she had done mammography test which was clear. What is the possibility that 'C' has reoccurred? We are in deep tension, please help Dr. Feeling scared.