International Journal of Breast Cancer 3 Table 1: Patient characteristics (1989–1999). Characteristic Patients, number (%) Race, number (%) Black, non-Hispanic Asian White, non-Hispanic Hispanic Size of tumor, median ± standard deviation, cm Size of tumor, number (%) <1 cm (nonpalpable) ≥1 cm (palpable) Unknown Stage, number (%) 0 1 2 3 4 Unknown Histologic type, number (%) Ductal Lobular Papillary Other Grade, number (%) 1 (well diﬀerentiated) 2 (moderately diﬀerentiated) 3 (poorly diﬀerentiated) Unknown Estrogen receptor, number (%) Positive Negative Unknown Progesterone receptor, number (%) Positive Negative Unknown Surgical Procedure, number (%) Mastectomy Lumpectomy No surgery Chemotherapy, number (%) Yes No Radiation therapy, number (%) Yes No 70–74 151 (38) 95 (63) 0 (0) 39 (26) 17 (12) 3.0 ± 2.7 8 (5) 126 (84) 16 (11) 10 38 59 23 20 1 104 (69) 4 (3) 2 (1) 41 (27) 7 (5) 48 (32) 24 (16) 72 (48) 69 (46) 14 (9) 68 (45) 63 (42) 24 (16) 64 (42) 66 (44) 67(44) 18 (12) 22 (14) 129 (85) 47 (31) 104 (69) Age 75–79 101 (27) 66 (65) 5 (5) 2 (2) 28 (28) 2.5 ± 2.0 7 (7) 82 (80) 13 (13) 13 22 39 9 16 2 68 (67) 4 (4) 1 (1) 28 (28) 6 (6) 26 (26) 13 (13) 55 (54) 44 (44) 21 (21) 48 (47) 32 (32) 21 (21) 48 (47) 50 (49) 42 (41) 9 (9) 12 (12) 89 (88) 21 (21) 80 (79) ≥80 141 (36) 73 (52) 7 (5) 2 (1) 59 (42) 3.0 ± 1.96 12 (9) 113 (80) 16 (11) 7 33 54 24 24 8 88 (62) 10 (7) 1 (1) 42 (30) 6 (4) 52 (37) 20 (14) 63 (45) 58 (41) 13 (9) 70 (50) 45 (32) 26 (18) 70 (50) 65 (46) 60 (42) 16 (11) 11 (8) 130 (92) 30 (21) 111 (79) Total 393 (100) 234 (59) 12 (3) 43 (11) 104 (26) 27 (7) 321 (82) 45 (11) 30 (8) 93 (24) 152 (39) 56 (14) 60 (15) 11 (3) 260 (66) 18 (4) 4 (1) 111 (28) 19 (5) 126 (32) 57 (14) 190 (43) 171 (43) 48 (12) 186 (47) 140 (36) 71 (18) 182 (46) 181 (46) 168 (42) 43 (11) 45 (12) 348 (88) 98 (25) 295 (75) P value P ≤ 0.001 S P ≤ 0.20 NS P ≤ 1 NS P ≤ 1 NS P ≤ 0.20 NS P ≤ 1 NS P ≤ 1 NS P ≤ 0.20 NS P ≤ 0.10 NS