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Two recently developed clonogenic assays for human tumor cells have been used to measure the in vitro radiation cell survival of four human tumors, a pancreatic carcinoma, a colonic carcinoma, an oat cell carcinoma of the lung, and a melanoma, propagated as xenografts in immune-suppressed mice. The slopes and shoulders of the survival curves for the first three tumors were all similar with Do's, respectively, of 94, 100, and 131 rads and with Dq's, respectively, of 8, 44, and 41 rads, However,pmid:202386 fatcat:vtesytmt5jccdagjch74txrxvy