Supplement Table 1. Relative risk of ipsilateral breast tumors associated with Asian race*

No. of patients§ / No. of ipsilateral breast tumors / RR (95% CI)ǁ
Chinese / 1411 / 72 / 1.22 (0.95, 1.55)
Japanese / 1405 / 53 / 1.03 (0.75, 1.40)
Filipino / 1505 / 65 / 1.23 (0.95, 1.58)
All other Asians / 1723 / 47 / 0.91 (0.68, 1.22)
Korean / 346 / 13
Vietnamese / 295 / 10
South Asian† / 320 / 8
Other Asian‡ / 76 / 3
Asians, NOS / 686 / 13
All Asians / 6044 / 237 / 1.10 (0.95, 1.28)¶

* Pacific Islanders (n=513) were excluded.

† South Asians included Asian Indians and Pakistanis

‡ Other Asians included Laotians, Hmongs, Kampucheans, and Thai

§ Patients who had been treated with mastectomy for their first DCIS were excluded.

ǁ Non-Hispanic Whites were the reference. The model was controlled for the covariates listed in the footnote of Table 2.

¶ The RR of ipsilateral DCIS and invasive cancer was 0.94 (95% CI, 0.70, 1.27) and 1.17 (95% CI, 0.99, 1.38; Pheterogeneity=0.32), respectively.

Supplement Table 2. Relative risk of contralateral breast tumors associated with Asian race*

No. of patients / Contralateral breast tumors / Contralateral DCIS / Contralateral invasive cancer
No. / RR (95% CI) § / No. / RR (95% CI) § / No. / RR (95% CI) §
Chinese / 2049 / 82 / 1.10 (0.88, 1.38) / 36 / 1.53 (1.08, 2.17) / 46 / 0.90 (0.67, 1.22)
Japanese / 1947 / 104 / 1.22 (0.96, 1.55) / 43 / 1.74 (1.19, 2.56) / 61 / 1.01 (0.74, 1.38)
Filipino / 2247 / 98 / 1.34 (1.09, 1.65) / 42 / 1.82 (1.32, 2.51) / 56 / 1.12 (0.85, 1.47)
All other Asians / 2490 / 66 / 0.95 (0.74, 1.22) / 28 / 1.26 (0.86, 1.84) / 38 / 0.81 (0.59, 1.12)
Korean / 497 / 15 / 5 / 10
Vietnamese / 433 / 9 / 4 / 5
South Asian† / 438 / 13 / 1 / 12
Other Asian‡ / 104 / 3 / 3 / 0
Asians, NOS / 1018 / 26 / 15 / 11
All Asians / 8733 / 350 / 1.14 (1.01, 1.30) / 1.56 (1.28, 1.92) ǁ / 0.96 (0.81, 1.13) ǁ

* Pacific Islanders (n=513) were excluded.

† South Asians included Asian Indians and Pakistanis

‡ Other Asians included Laotians, Hmongs, Kampucheans, and Thai

§ Non-Hispanic Whites were the reference. The model was controlled for the covariates listed in the footnote of Table 4.

ǁ Pheterogeneity<.0001