I don't know what an interruption in using tamoxifen would do to your chance of recurrence. The studies probably would have all been done based on continuous use. Your oncologist may have a sense of the effects of temporarily stopping based on his clinical practice. Your oncologist will also know what your original chance of recurrence was, and that would be a factor in knowing how much harm may have been done by stopping for six months. I would suspect that whatever harm might have been done would be reversed by going back on tamoxifen, but your oncologist would be the best person to ask.
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