Breast Cancer by Age at Diagnosis in the Gharbiah, Egypt, Population-Based Registry Compared to the United States Surveillance, Epidemiology, and End Results Program, 2004–2008

Table 3

Age stratified average incidence rates by country of residence and breast cancer characteristics, Egypt’s GCR, and US SEER cases, 2004–2008.

Variable	Incidence rate per 100,000 woman-years (95% confidence interval)
	25–39 years of age		40–54 years of age		≥55 years of age
Registry	Egypt’s GCR	US SEER	Egypt’s GCR	US SEER	Egypt’s GCR	US SEER
Grade
Low (I/II)	17.4 (15.7–19.2)	11.9 (11.6–12.3)	76.5 (72.3–80.9)	95.2 (94.3–96.1)	91.2 (85.3–97.4)	221.4 (220.1–222.7)
High (III/IV)	2.3 (1.7–3.0)	17.9 (17.5–18.3)	8.2 (6.9–9.7)	68.5 (67.7–69.3)	11.8 (9.7–14.1)	104.7 (103.8–105.6)
Hormone Receptor
Positive	10.3 (9.0–11.7)	19.4 (19.0–19.8)	45.2 (42.0–48.5)	125.9 (124.9–127.0)	56.4 (51.8–61.3)	268.3 (266.8–269.7)
Negative	2.8 (2.1–3.5)	10.2 (9.9–10.5)	13.8 (12.1–15.7)	38.4 (37.9–39.0)	16.0 (13.6–18.7)	58.9 (58.2–59.6)
Histology
Other	6.3 (5.3–7.4)	6.6 (6.3–6.8)	29.8 (27.2–32.6)	47.6 (47.0–48.3)	40.5 (36.6–44.7)	117.7 (116.7–118.6)
Duct, NOS	19.5 (17.7–21.4)	25.6 (25.1–26.1)	84.1 (79.8–88.7)	130.0 (128.9–131.0)	107.0 (100.6–113.7)	245.9 (244.5–247.3)
AJCC stage group
I	0.9 (0.6–1.4)	8.6 (8.4–8.9)	4.6 (3.6–5.7)	73.0 (72.2–73.8)	5.3 (3.9–6.9)	174.9 (173.7–176.1)
II	7.5 (6.4–8.7)	13.8 (13.4–14.1)	37.7 (34.8–40.8)	63.6 (62.8–64.3)	42.2 (38.2–46.5)	105.4 (104.5–106.3)
III	9.8 (8.6–11.2)	6.1 (5.9–6.3)	40.3 (37.3–43.5)	24.4 (24.0–24.9)	49.6 (45.2–54.2)	36.9 (36.4–37.5)
IV	2.4 (1.8–3.1)	1.8 (1.7–2.0)	9.2 (7.8–10.8)	7.5 (7.2–7.7)	18.0 (15.4–20.8)	19.5 (19.1–19.9)
Race^a
White	—	30.0 (29.4–30.6)	—	171.3 (169.9–172.7)	—	350.1 (348.3–351.9)
Black	—	34.6 (33.1–36.2)	—	163.9 (160.6–167.3)	—	312.3 (307.4–317.4)
AI/AN	—	14.8 (11.9–18.3)	—	81.6 (74.3–89.5)	—	155.9 (144.1–168.4)
API	—	27.5 (26.1–29.0)	—	152.0 (148.4–155.7)	—	232.6 (227.9–237.3)
Hispanic	—	23.5 (22.6–24.5)	—	125.8 (123.2–128.4)	—	238.9 (234.7–243.2)
Non-Hispanic	—	32.5 (31.8–33.1)	—	176.6 (175.2–177.9)	—	347.8 (346.0–349.5)
Total	25.7 (23.7–27.9)	32.2 (31.7–32.7)	113.9 (108.8–119.2)	177.6 (176.4–178.8)	147.5 (139.9–155.4)	363.5 (361.8–365.2)

AI/AN: American Indian/Alaska Native; API: Asian/Pacific Islander; stat cannot calculate other/unknown category incidence rates; —: race/ethnicity unavailable in GCR.