{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,25]],"date-time":"2026-08-25T09:19:03Z","timestamp":1787649543014,"version":"build-2736575974"},"reference-count":16,"publisher":"SAGE Publications","issue":"3","license":[{"start":{"date-parts":[[2025,11,18]],"date-time":"2025-11-18T00:00:00Z","timestamp":1763424000000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["Int J Surg Pathol"],"published-print":{"date-parts":[[2026,5]]},"abstract":"<jats:sec>\n                    <jats:title>Introduction<\/jats:title>\n                    <jats:p>Simultaneous occurrence of multiple primary cancers is rare, and even rarer is the phenomenon of one cancer metastasizing to another. Here, we present a mammary carcinoma and renal cell carcinoma (RCC) diagnosed concurrently while presenting as a tumor-to-tumor metastasis.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Case Report<\/jats:title>\n                    <jats:p>A 79-year-old woman with right pleural effusion underwent thoracocentesis. Cytological and immunohistochemical examination revealed malignant cells suggestive of adenocarcinoma, mammary origin. Computed tomography of abdomen and chest revealed a 1.6\u2005cm right breast nodule, 4.4\u2005cm right axillary mass, and right renal lesion measuring 3.0\u2009\u00d7\u20091.6\u2005cm. Core biopsy of the renal lesion showed 2 populations of cells. One population exhibited moderate cytoplasm and enlarged nuclei displaying anisonucleosis and hyperchromasia, arranged singly as well as in sheets and clusters. These cells stained positive for GATA3, estrogen receptor, mammaglobin, and keratin 7. Intermixed were the second population of cells with clear cytoplasm and low nuclear grade, forming sheets, replacing renal tissue. These cells were positive for CA9, CD10, and PAX8 and negative for P40. Based on these findings, a diagnosis of clear cell RCC harboring metastatic breast carcinoma was established.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>RCC and breast carcinoma are known to increase the occurrence of each other. When breast and renal lesions are identified concurrently, the possibility of breast metastasis should be strongly considered. The concurrent appearance of RCC harboring metastatic breast cancer is rare. This contributes valuable insights into the complex interplay between different cancer types. Understanding these rare phenomena can aid in refining diagnostic approaches and treatment strategies.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1177\/10668969251389012","type":"journal-article","created":{"date-parts":[[2025,11,18]],"date-time":"2025-11-18T18:24:17Z","timestamp":1763490257000},"page":"771-775","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":1,"title":["Mammary Carcinoma Metastasizing to Renal Cell Carcinoma: A Rare Example of Tumor-to-Tumor Metastasis"],"prefix":"10.1177","volume":"34","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-1395-9567","authenticated-orcid":false,"given":"Vidhya Dharshini","family":"Murugesan","sequence":"first","affiliation":[{"name":"North Shore University Hospital and Long Island Jewish Medical Center, Donald and Barbara Zucker School of Medicine at Hofstra\/Northwell Health"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Saroja Devi","family":"Geetha","sequence":"additional","affiliation":[{"name":"North Shore University Hospital and Long Island Jewish Medical Center, Donald and Barbara Zucker School of Medicine at Hofstra\/Northwell Health"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3299-4201","authenticated-orcid":false,"given":"Neha","family":"Seth","sequence":"additional","affiliation":[{"name":"North Shore University Hospital and Long Island Jewish Medical Center, Donald and Barbara Zucker School of Medicine at Hofstra\/Northwell Health"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Philip","family":"Ort","sequence":"additional","affiliation":[{"name":"North Shore University Hospital and Long Island Jewish Medical Center, Donald and Barbara Zucker School of Medicine at Hofstra\/Northwell Health"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kasturi","family":"Das","sequence":"additional","affiliation":[{"name":"North Shore University Hospital and Long Island Jewish Medical Center, Donald and Barbara Zucker School of Medicine at Hofstra\/Northwell Health"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2025,11,18]]},"reference":[{"key":"e_1_3_2_2_2","doi-asserted-by":"publisher","DOI":"10.1007\/978-1-59745-416-2_5"},{"key":"e_1_3_2_3_2","doi-asserted-by":"publisher","DOI":"10.1007\/s10354-019-0694-y"},{"key":"e_1_3_2_4_2","first-page":"406","article-title":"Seltene metastsenbildung","volume":"13","author":"Berent W","year":"1902","unstructured":"Berent W. Seltene metastsenbildung. Zentralbl Allg Pathol. 1902;13:406.","journal-title":"Zentralbl Allg Pathol"},{"key":"e_1_3_2_5_2","doi-asserted-by":"publisher","DOI":"10.1002\/1097-0142(196809)22:3<635::AID-CNCR2820220320>3.0.CO;2-O"},{"key":"e_1_3_2_6_2","doi-asserted-by":"publisher","DOI":"10.1007\/BF00049477"},{"key":"e_1_3_2_7_2","doi-asserted-by":"publisher","DOI":"10.1016\/0090-4295(87)90568-1"},{"key":"e_1_3_2_8_2","unstructured":"World Health Organization. Breast cancer. World Health Organization; 2024. 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