Apocrine carcinoma, paget's disease, spindle shaped cells, and retroviruses

Looking at the areas of overlap seems to link retroviruses to them

Apocrine breast cancers (1%)

Paget's disease and apocrine breast cancer
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3229951/

Her2 spindle cell carcinoma with apocrine carcinoma of breast
https://www.hindawi.com/journals/cripa/2014/310829/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4053236/

as spindle cancers are these retroviruses induced?

a protein from apocrine breast cancer related to retroviruses
https://www.ncbi.nlm.nih.gov/pubmed/10713110

Paget's disease and chrondrosarcomas
https://www.ncbi.nlm.nih.gov/pubmed/9297756
https://www.ncbi.nlm.nih.gov/pubmed/15895907
http://www.healio.com/orthopedics/journals/ortho/2004-1-27-1/%7B51abef2f-83dd-4c8e-94a9-e40193aff76e%7D/femoral-chondrosarcoma-complicating-pagets-disease-of-bone

HTLV and Paget's overlap ?
https://www.ncbi.nlm.nih.gov/pubmed/8212554

HTLV and eccrine sweat glands
http://onlinelibrary.wiley.com/doi/10.1002/(SICI)1097-0215(19990301)80:5%3C652::AID-IJC3%3E3.0.CO;2-P/full

bovine leukemia virus and breast cancer
https://wwwnc.cdc.gov/eid/article/20/5/13-1298_article
http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0134304