Table 1.

General characteristics of patients with first primary and second primary esophageal cancer from 13 cancer registries

Esophageal cancer as first primary
Esophageal cancer as second primary
Total
With second cancer

n (%)n (SPC %)n (%)
Total52,589959 (1.8)3,731
Sex
    Female19,110 (36.3)295 (1.5)1,395 (37.4)
    Male33,479 (63.7)664 (2.0)2,336 (62.6)
Age at diagnosis (y)
    <566,573 (12.5)127 (1.9)240 (6.4)
    56-6513,054 (24.8)275 (2.1)661 (17.7)
    66-7416,363 (31.1)338 (2.1)1,168 (31.3)
    75+16,599 (31.6)219 (1.3)1,662 (44.5)
Calendar period at diagnosis
    ∼197414,668 (27.9)192 (1.3)382 (10.2)
    1975-198312,717 (24.2)240 (1.9)672 (18.0)
    1984-199011,788 (22.4)278 (2.4)1,052 (28.2)
    1991∼13,416 (25.5)249 (1.9)1,625 (43.6)
Time since first cancer diagnosis
    <6 mo26,330 (50.1)329 (1.2)313 (8.4)
    6-11 mo12,732 (24.2)99 (0.8)237 (6.3)
    1-4 y11,048 (21.0)313 (2.8)1,358 (36.4)
    5+ y2,479 (4.7)218 (8.8)1,823 (48.9)
Morphologic group
    Adenocarcinoma10,049 (19.1)197 (2.0)839 (22.5)
    SCC28,036 (53.3)604 (2.2)2,085 (55.9)
    Other or unspecified14,504 (27.6)158 (1.1)807 (21.6)
Registries
    Australia, New South Wales (1972-1997)5,167 (9.8)102 (2.0)391 (10.5)
    Canada, British Columbia (1970-1998)2,697 (5.1)88 (3.3)302 (8.1)
    Canada, Manitoba (1970-1998)795 (1.5)33 (4.2)99 (2.7)
    Canada, Saskatchewan (1967-1998)539 (1.0)25 (4.6)66 (1.8)
    Denmark (1943-1997)8,026 (15.3)132 (1.6)710 (19.0)
    Finland (1953-1998)9,543 (18.1)79 (0.8)390 (10.5)
    Iceland (1955-2000)438 (0.8)17 (3.9)32 (0.9)
    Norway (1953-1999)5,062 (9.6)99 (2.0)392 (10.5)
    Singapore (1968-1992)2,579 (4.9)24 (0.9)49 (1.3)
    Slovenia (1961-1998)2,075 (3.9)34 (1.6)130 (3.5)
    Spain, Zaragoza (1978-1998)507 (1.0)10 (2.0)31 (0.8)
    Sweden (1961-1998)5,010 (9.5)142 (2.8)435 (11.7)
    United Kingdom, Scotland (1975-1996)10,151 (19.3)174 (1.7)704 (18.9)
  • Abbreviation: SPC, second primary cancer.