TABLE 4.
Characteristics of patients with ATL during three different periods: 1984–1985, 1992–1993, and 2010–2011.
| Year of diagnosis of patients | 1984–1985 | 1992–1993 | 2010–2011 |
| Total no. of patients | 181 | 712 | 996 |
| Evaluable no. of patients | NA | NA | 922 |
| M/F ratio | 1.4 | 1.13 | 1.12 |
| Subtype | |||
| Acute | 102(56.4%) | 489(69.4%) | 456(49.5%) |
| Lymphoma | 38(21.0%) | 151(21.4%) | 237(25.7%) |
| Chronic | 25(13.8%) | 36(5.1%) | 131(14.2%) |
| Smoldering | 16(8.8%) | 29(4.1%) | 98(10.6%) |
| Age at diagnosis, year | |||
| min, max (mean) | 24,90(56.9) | 25,87(58.9) | 34,100(67/5) |
| Age at diagnosis category | |||
| <40 years | NA | 31 (4.4) | 9 (1.0) |
| 40–49 | NA | 133 (18.7) | 42 (4.6) |
| 50–59 | NA | 209 (29.4) | 152 (16.5) |
| 60–69 | NA | 191 (26.9) | 307 (33.3) |
| 70–79 | NA | 122 (17.2) | 282 (30.6) |
| 80< | NA | 24 (3.4) | 130 (14.1) |
| Geographic area at diagnosis | |||
| Hokkaido/Tohoku | 42(23.6%) | 51(7.2%) | 50(5.4%) |
| Kanto | 9(5.1%) | 35(4.9%) | 59(6.4%) |
| Chubu-Hokuriku | 1(0.6%) | 91(12.8%) | 55(6.0%) |
| Kinki | 6(3.4%) | 90(12.7%) | 88(9.5%) |
| Chugoku-Shikoku | 24(13.5%) | 39(5.5%) | 48(5.2%) |
| Kyushu-Okinawa | 96(53.9%) | 401(56.5%) | 622(67.5%) |
ATL = adult T-cell leukemia-lymphoma; IQR = interquartile range; SD = standard deviation; NR = not reported; NA = figure was available but information on the number was not; SD = standard deviation.