“…Thirty-six (68%) of our included studies reported costs for early-stage cancer [ 19 , 20 , 22 , 24 – 27 , 29 – 31 , 34 – 40 , 44 – 48 , 53 – 58 , 60 – 62 , 65 – 67 , 70 , 71 ]; 17 (32%) included metastatic cancer [ 20 – 23 , 25 , 27 , 30 , 33 , 36 , 38 – 40 , 50 , 53 , 60 , 68 , 70 ]; 12 (23%) included both early and metastatic cancer [ 20 , 22 , 25 , 27 , 30 , 36 , 38 – 40 , 53 , 60 , 70 ]; for 12 (23%), the cancer stage was not reported [ 28 , 32 , 41 – 43 , 49 , 51 , 52 , 59 , 63 , 64 , 69 ]. Generally, across our included studies, metastatic breast cancer was associated with higher costs than earlier stage cancer (see Figs.…”