Discussion Comparing rates of BC across the four biggest Nordic countries, we found an increasing trend in the incidence of BC in the oldest age group, 80+ in all countries, from 2012 to 2021.
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Trends in breast cancer among elderly women: Development in estrogen and HER2 subtypes in the last ten years.
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Furthermore, in the 60–69 age group, the ER-/HER2- subtype had a decreasing trend: -1.87 % (95 % CI: -3.59 %: -0.11 %) but was not significant either ( Table 3 .).