Use of fiber endoscopes for a therapeutic purpose in gastrointestinal tract diseases

In authors' opinion an inadequate knowledge of the clinical course and disparagement of the role of puncture and operation biopsies constitute the causes of hypodiagnosis of primary malignant tumors. An exceptional use of repeated operations in case of "histologic discoveries" of the tumors together with underestimation of radialogic and hormonal treatment should be considered as therapeutic errors.