title: Effect of surgical removal on the growth and kinetics of residual tumor.
abstract: Findings from this study using a transplantable C3H mammary tumor failed to indicate interaction relative to growth parameters between two foci present in the same host. Whether they were growing alone or in the presence of a second focus, tumor growth rates were similar until the combined mass of multiple tumors approached that which was incompatible with survival. Only then was a difference in growth observed. Cytokinetic parameters, i.e., labeling index, primer-dependent DNA polymerase index or growth fraction, DNA synthesis time, tumor doubling time, and cell cycle time, were also similar whether tumors grew alone or in the presence of a second focus. Following removal of a tumor, changes were observed within 24 hr in the kinetics of the residual focus. There was an increase in labeling index (duration approximately equal to 10 days) and primer-dependent DNA polymerase index with a decrease in the tumor doubling time. Minimal change was noted in DNA synthesis time and cell cycle time. The kinetic changes observed were reflected in a measureable increase in tumor size approximately equal to a week following tumor removal. Absence of an alteration in DNA synthesis time and cell cycle time indicates that the increase in tumor growth was probably due to a conversion of noncycling cells in G0 phase into proliferation. Relationship of the findings to the use of adjuvant chemotherapy is considered.
mesh_terms: D000818:Animals; D002453:Cell Cycle; D002455:Cell Division; D004273:DNA, Neoplasm / Q000096:biosynthesis; D004195:Disease Models, Animal; D005260:Female; D007700:Kinetics; D008325:Mammary Neoplasms, Experimental / Q000473:pathology / Q000556:secondary* / Q000601:surgery; D051379:Mice; D008809:Mice, Inbred C3H; D009362:Neoplasm Metastasis / Q000473:pathology*
chemical_list: D004273:DNA, Neoplasm