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Metastatic Disease

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Metastatic disease may be an incidental finding in asymptomatic patients. It may present with nonspecific symptoms such as malaise or weight loss, and it may present with symptoms and signs related to the metastatic site as dyspnea, lymph node enlargement, bone tenderness, or signs of increased intracranial tension.

Diagnostic work up includes history taking, thorough physical examination, CBC, liver function tests, diagnostic CT scans of the chest and abdomen, brain MRI and bone scan according to symptoms (NCCN guidelines, 2016).

As early as 1996, Moon et al evaluated the use of Whole-Body Fluorine-18-FDG PET in 57 patients suspected to have recurrent or metastatic breast cancer and proved that FDG PET was 93% sensitive and 79% specific …show more content…

The consensus of the NCCN panel is that FDG PET/CT is optional (category 2B) and most helpful in situations where standard imaging results are suspicious or equivocal.

The NCCN panel also recommends that metastatic disease at presentation or first recurrence should be biopsied as part of the work up for patients with recurrent or stage IV disease.
Biopsy helps determine whether this metastatic disease belongs to the breast primary or another primary, and more importantly to determine the hormone receptor status of this recurrence/metastasis.

A recent prospective study has demonstrated a substantial rate of discordance in hormone receptor status (40% discordance in ER/PgR status and 8% discordance in Her2 status) between primary and suspected metastatic lesions in women with breast cancer. This study has also linked changes in hormone receptor status with impact on management, and proved that 20% of patients had a significant change in their management plan (Simmons et al, …show more content…

The relative contribution of each of these factors to the overall discordance rate is unclear (Pusztai et al, 2010).

Lindstrom and colleagues assessed in a cohort study intraindividual ER, PR, and HER2 status variations in multiple consecutive relapses in breast cancer patients. Interestingly, all three markers were unstable in similar proportions in the relapse setting. For ER and PR, one in three patients had discordant hormone receptor status between different relapses. While HER2 status changed in 15.7% of patients between consecutive relapses (Lindstrom et al, 2012).

Since tumor instability is not only seen between the primary and relapse setting but also throughout tumor progression, this makes clinical decisions more difficult and makes taking biopsies in a consecutive manner in the advanced setting a very important step to optimize treatment decision making for patients (Lindstrom et al,

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