“…AAT is expressed not only in normal livers but also in other normal tissues such as the lung, gall bladder, pancreas, and the gastrointestinal tract (Tuttle & Jones, 1975;Ray et al, 1978;Kittas et al, 1982a;Geboes et al, 1982;Tahara et al, 1984;Aroni et al, 1984). Moreover, AAT has also been demonstrated in several neoplasms including carcinomas, mesenchymal tumours, hemopoietic and brain tumours (Reintoft & Hargerstrand, 1979;Kittas et al, 1982b;Glasgow et al, 1982;Aroni et al, 1984;Tahara et al, 1984;Krugliak et al, 1986;Wittekind et al, 1986;Sawaya et al, 1987;Soini & Miettinen, 1989;Kataoka et al, 1989;Perlmutter et al, 1989;Karashima et al, 1990). The presence of AAT in tumour cells is now considered to be due to its production by tumour cells themselves (Glasgow et al, 1982;Perlmutter et al, 1989;Kataoka et al, 1989).…”