A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . Fig. 119G.—Choriocarcinoma. The nodule from which thissection was made came from the vaginal wall. X Fia. 1197.—Gelatinous Carcinoma of the llectum ShowingEpithelial Cells Distended with Mucus. X 1000. type may be wholly lost and the metastatic nodulesbear little or no resemblance to the primary tumor. Etiology.—With the ultimate forces which giveto the cell of a carcinoma the power of indefinite pro-liferation we are still unacquainted. All that isknown is t
A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . Fig. 119G.—Choriocarcinoma. The nodule from which thissection was made came from the vaginal wall. X Fia. 1197.—Gelatinous Carcinoma of the llectum ShowingEpithelial Cells Distended with Mucus. X 1000. type may be wholly lost and the metastatic nodulesbear little or no resemblance to the primary tumor. Etiology.—With the ultimate forces which giveto the cell of a carcinoma the power of indefinite pro-liferation we are still unacquainted. All that isknown is that a group of cells begins to grow beyond 629 Carcinoma REFERENCE HANDBOOK OF THE MEDICAL SCIENCES the tissue limits normally prescribed in our anatomicalexperience. Such cells may show a quite extraordi-narj rate of growth, surpassed only by the tissues oftheembryo. It is generally recognized that as thebody cells become more highlj differentiated duringpostnatal life they lose to a large degree their vigorousproliferative power and their activities are confinedto the replacement of injured or dead cells or to thesecretion of specific substances. They do not, inother words, have the capacity of growing indefinitelyin strang
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