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Japanese Journal of Cancer Research : Gann logoLink to Japanese Journal of Cancer Research : Gann
. 2000 Nov;91(11):1169–1176. doi: 10.1111/j.1349-7006.2000.tb00901.x

Retinoic Acid Receptor and Retinoid × Receptor in Ductal Carcinoma in situ and Intraductal Proliferative Lesions of the Human Breast

Naohiro Ariga 1,2,✉, Takuya Moriya 1, Takashi Suzuki 1, Michio Kimura 3, Noriaki Ohuchi 2, Hironobu Sasano 1
PMCID: PMC5926283  PMID: 11092983

Abstract

Retinoic acid (RAR) and retinoid × receptors (RXR) are essential in the transcriptional actions of retinoids. To date, RAR and RXR have not been examined in precancerous lesions and/or ductal carcinoma in situ (DCIS) in human breast. Therefore, we examined RAR and RXR subtypes in DCIS (58 cases), atypical ductal hyperplasia (ADH) (32 cases), and proliferative disease without atypia (PDWA) (32 cases) to study the status of these RARs and RXRs. Immunoreactivities for RAR α, RXR α, RXR β, and RXR γ were all detected in the nuclei of normal ductal epithelia. Immunoreactivity for RAR β was detected exclusively in the nuclei of myoepithelial cells, but not in normal ductal epithelia. Immunoreactivity for RAR γ was not detected in any of the breast tissues examined except for a few cases of PDWA and ADH, and 11 cases of DCIS. The RXR α labeling index (LI) was significantly higher in both DCIS (mean 77.9) and ADH (mean 77.7) than in PDWA (mean 62.8) (P<0.001). RXR β LI was significantly lower in DCIS (mean 81.5) than in both ADH (mean 91.1) and PDWA (mean 91.9) (P=0.0001). Immunoreactivity for RAR α, RXR α, RXR β and RXR γ was widely distributed compared to that of RAR β and RAR γ in DCIS, ADH and PDWA. RAR α LI was significantly correlated with Ki67 LI in DCIS (P=0.0040), especially in estrogen receptor (ER)‐positive DCIS. Our results suggest that RXRs are much more widely distributed than RARs in intraductal proliferative lesions of the human breast, but ER‐positive DCIS cases with high cell proliferative activity are associated with RAR α, suggesting the possible involvement of retinoids through RAR α in tumor cell proliferation in DCIS.

Keywords: RAR, RXR, DCIS, Human breast, Proliferative disease

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