Registry Singapore Cancer Registry NRCA097 PRI_TUMOUR Primary tumour (before 2003) 0=carcinoma-in-situ, 1=cancer restricted to primary organ or tissue of origin, 2=local extension beyond primary organ or tissue of origin, 8=carcinoma-in-situ which subsequently becomes invasive, 9=unknown or not applicable, blank=missing – i) after 2003, ii) missing 1968-2020