SOD1 and neoplasm: These were evaluated: weight and abdominal circumference both measured on the first and tenth day; volume of ascites; viable ascites tumor cells; number of cells of lymphoid organs (femur, spleen and inguinal lymph nodes), by optical microscopy; NO in the ascites and spleen, determined by nitrites, measured by colorimetric assay; arginase in ascites; SOD in ascites; and immunophenotyping of spleen.