We investigated14Cspecific activity of farm products and marine products which were collected from the Rokkasho area in Aomori prefecture from 1988 to 1990. The measured14Cspecific activity of farm products was almost equal to one another with the averaged14Cspecific activity of 0.261 (Bq/g·C) . On the other hand, 14Cspecific activity of marine products was slightly lower than those of farm products. Especially that of squid was the lowest among studied marine products. This may be due to the low14Cspecific activity of the sea water surrounding squid.
We measured the level of serum CYFRA 21-1 (CYFRA) in 38 primary lung cancer patients (21 adenocarcinomas (A Cs), 12 squamous cell carcinomas (SqCCs) and 5 small cell carcinomas (SmCCs) ) before undergoing therapy using a “CYFRA immunoradiometric assay kit”. We thus determined the CYFRA cut-off level to be 1.7 ng/ ml. We also measured both the carcinoembryonic antigen (CEA), and the squamous cell carcinoma antigen (SCC) levels. The positive rate for CYFRA in patients with lung cancer was 71% and such positivity was related to their histology (SqCCs, SmCCs 100% ; ACs 48%) . The level of CYFRA was significantly higher in SgCCs than in either ACs or SmCCs. No significant differences were observed in the serum CYFRA value among the various clinical stages. In addition, no significant correlation was seen between CYFRA and SCC, or between CYFRA and CEA. Among the various clinical stages of SqCCs, the positive rate of CYFRA was higher in the early clinical stages than in SCC. Our findings therefore support the usefulness of CYFRA as a marker of SqCCs.