Local recurrences and distant metastases are partially independent events that occur at different times; several predicting factors also differ. However, women with local recurrences have increased risk of distant metastases. In particular, women 35 years old or younger at first diagnosis who had initial peritumoral lymphatic invasion and local recurrence within 2 years are at high risk for distant spread. For recurrence in cases with an extensive intraductal component or where initial local surgery was possibly inadequate, women are at lower risk.

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Visual and ophthalmologic complaints are common during 4-HPR treatment; their estimated 5-year cumulative incidence is close to 20% and 8%, respectively. However, the pattern of occurrence over time and the underlying mechanisms of these two types of complaints seem different.