The occurrence of
multiple primary cancers is rare; it can be missed as a disease progression.
The etiology remains controversial. We report a case of a 55-year-old female
with metastatic renal cell carcinoma treated with sutent followed by left sided
nephrectomy. Follow-up CT showed increase in the size of the right axillary
lymph nodes which was proven after biopsy to be metastatic adenocarcinoma of
the breast. Any suspicious disease progression in a single site not
compatible with disease history should be biopsied for confirmation. The
relationship between renal cell carcinoma and breast cancer is still unclear,
and more case reports are required to determine this relationship.