G. Soos et al., COMPARATIVE INTRAOSSEAL GROWTH OF HUMAN PROSTATE-CANCER CELL-LINES LNCAP AND PC-3 IN THE NUDE-MOUSE, Anticancer research, 17(6D), 1997, pp. 4253-4258
Background: More than 75% of patients with advanced prostate carcinoma
have skeletal involvement which is the principal metastatic site and
the major complication of this disease. The goal of this work was to c
ompare the osseous metastasis of androgen-sensitive and insensitive pr
ostate cancers in the nude mouse. Materials and methods: Androgen-sens
itive LNCaP or -insensitive PC-3 human prostate carcinoma cells were i
njected directly into the femur medullas of male nude Beige mice, the
animals were then sacrificed at successive time intervals to study the
gross and microscopic characteristics of the established tumors. Resu
lts: LNCaP and PC-3 both colonized in the bone marrow within a week, t
hen gradually expanded to the entire bone medulla followed by osseous
infiltration to produce obvious symptoms in the affected extremities.
Based on the morphology, both osteoblastic and osteolytic changes occu
rred during the course of tumor progression. In addition, PC-3 tumors
eventually broke through the bone cortex, invaded the surrounding tiss
ues, and metastasized to the regional lymph nodes. In contrast, LNCaP
remained localized within the bone, and appeared to eventually regress
and die after displacing the normal bone marrow cells. Immunohistoche
mically, LNCaP tumors were consistently positive for prostate-specific
antigen in bone metastasis, while PC-3 tumors were negative. Tumor ce
ll nuclei of both PC-3 and LNCaP hybridized to a human repealed sequen
ce DNA probe indicating that the proliferating malignant cells were of
human origin. Conclusions: These cancel cell lines produced a high in
cidence of growth in the bone that differed in histogenesis. The relat
ive malignancy of these cell lines was demonstrated in this model.