Table 2. Adjuvant treatment according to DBCG-protocols of women with cosmetic silicone breast implants prior to cancer diagnosis (cases) and women from the background population (controls).

	Cases (n=23)	Controls (n=253)
Adjuvant treatment according to protocola	n	%	n	%	OR (95% CI)b
Subsequent adjuvant treatment (any)
No	6	26	63	24	1.2 (0.4–3.2)
Yes	14	61	175	69	P=0.73
Unknown	3	13	15	6
Subsequent chemotherapy
No	11	48	98	39	2.3 (0.8–6.9)
Yes	5	22	103	41	P=0.12
Unknown	7	30	52	21
Subsequent endocrine therapy
No	11	48	157	62	0.6 (0.2–1.9)
Yes	5	22	44	17	P=0.39
Unknown	7	30	52	21
Subsequent radiotherapy
No	10	43	129	51	0.8 (0.3–1.8)
Yes	12	52	119	47	P=0.56
Unknown	1	4	5	2

^aSee The DBCG Secretariat (1998).

^bWomen with implants (cases) compared with women without implants (controls). Women with missing information with regard to the variable under study were excluded from the analysis.