Short-term cultures initiated from a pancreatic adenocarcinoma were cytogenetically investigated. The composite karyotype was 74-76,XX,+X,+2,+3,+del(3)(p21),+5,+5,+der(7) t(1;7)(q21;p22),+der(7),del(8)(p21),+del(8)(p21),+der(8)t(8;?)(q24; +),+9,+9,+10,+10,+11,+11,+12,+13,+14,+der(14)t(14; +)(p11;?),+der(16)t(15;16)(q11;p13),+der(16),+der(17)t(17;?) (p11;?),+der(17),+18,+20,+20,-21,-21,+22,+22,+1-3mar. A comparison with the few previously cytogenetically characterized cases of this tumor type reveals no consistent abnormalities.