Henry Ford Hospital Medical Journal


We have performed linkage analysis on 32 families with hereditary medullary thyroid cancer (MTC) wilh seven polymorphic DNA probes situated near the centromere of chromosome 10. Nineteen of these families were affected with multiple endocrine neoplasia type 2A (MEN 2A), and the remainder had MTC without pheochromocytoma. There were no instances of recombination between the MEN 2 A susceptibility gene and the IRBP.H4 marker. Two other probes, TBM.34 and MCK2, are also tightly linked(θ = 0.00 and θ = 0.02. respectively). Because TBM.34 and IRBP.H4/MCK2 are situated on opposite sides of the MEN 2A gene, screening with flanking DNA markers is now feasible.