SPOCK1 and mucinous adenocarcinoma: Compared with the expression in 18.8% of IDC cases, SPOCK1 expression was rarely observed in cases of invasive lobular carcinoma (2/35), micropapillary carcinoma (1/7), mucinous carcinoma (0/10), invasive papillary carcinoma (0/8), invasive neuroendocrine carcinoma (0/4), and tubular carcinoma (0/2) (Table 3).