ENDOU (PP11) was detected in 66.7% of analyzed mucinous cystadenocarcinomas, 57.1% of serous cystadenocarcinomas, but not in normal ovaries, 47% of breast cancers and 38% of all testicular and gastric cancers (Inaba et al., 1980; Inaba et al., 1981; Inaba et al., 1982). Here, ENDOU is linked to mucinous cystadenocarcinoma.