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Accuracy of Screening Methods for Thediagnosis of Breast Disease

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Accuracy of Screening Methods for Thediagnosis of Breast Disease BRITISH 21 November 1970 MEDICkL JOURNAL 461 Accuracy of Screening Methods for the Diagnosis of Breast Disease Br Med J: first published as 10.1136/bmj.4.5733.461 on 21 November 1970. Downloaded from ISOBEL G. FURNIVAL,* M.B., CH.B.; HELEN J. STEWART,t M.B., F.R.C.S.ED.; J. M. WEDDELL,t M.B., B.S. P. DOVEY,§ M.B., F.F.R.; I. H. GRAVELLE,II M.R.C.P.ED., F.F.R.; K. T. EVANS,¶ M.R.C.P., F.F.R. A. P. M. FORREST,** M.D., CH.M., F.R.C.S.(ENG.,ED.,GLASG.) British Medical Journal, 1970, 4, 461-463 Summary: Clinical examination, thermography, and on hips in the thermography room for 15 minutes. This was 70-mm. mammography were performed in 891 to allow cooling of the breasts and axillae to the temperature patients-414 presented to hospital with symptoms of of the room, which was maintained between 18 and 21GC. breast disease and 477 were asymptomatic. Comparison of The hands were raised above the head and the breasts were the diagnostic accuracy of these methods showed that scanned individually with the infrared camera. Frontal and neither thermography nor 70-mm. mammography has a oblique views of both breasts were taken and the ther- useful place as an isolated screening procedure for breast mographic image obtained on the oscilloscope screen was cancer. In fact, we consider such a policy dangerous. recorded on 35-mm. panchromatic film. Then 70-mm. mam- mography was carried out on an Odelca photofluoro- graphic unit. This unit produces a 70-mm. photograph of the Introduction fluorographic image of the breast. Two standard views were taken of both breasts. increasing interest in the development (craniocaudal and mediolateral) Recently there has been As the fine-focus x-ray tube and an Odelca camera unit were of mass screening techniques for the early diagnosis of car- mounted on a motorized stand, the position of the tube could The most significant study from New cinoma of the breast. be rapidly changed while the patient remained stationary in York has been designed to compare the mortality from breast the erect position. In this way complete radiographic exami- cancer in women in whom regular annual screening has been nation of both breasts could be carried out in five minutes. It carried out by clinical examination and mammography with took about 40 minutes to survey each patient by all three the mortality of those who are receiving normal medical care methods. (Strax et al., 1967, 1968, 1969; Venet et al., 1969). Though the The results of each form of investigation were separately final evaluation of this study must await assessment of mor- and independently reported. For thermography and 70-mm. tality, it is already apparent that those cases of breast cancer mammography independent reports were received from three which have been discovered in the screened group have a radiologists, each of whom examined the thermography and lower incidence of lymphatic involvement than those arising without of the in the control population. It is also clear that both methods mammography films separately knowledge or her As all films were processed in of examination are required for satisfactory screening and patient complaints. there was no for repeat examination that clinical examination or mammography alone detected batches opportunity the films be unsatisfactory. only about half of the total number of cancers discovered. should The patients with symptomatic disease had also been Mammography, as ordinarily performed, uses large film examined by a consultant surgeon. Further, all patients with http://www.bmj.com/ and the radiographic image is the same size as the patient's of those in the control breast. It is time-consuming and expensive. Alternative symptomatic breast disease and most an examination which simpler diagnostic methods which might be suitable for series had full-size mammography, of our routine assessment of with breast screening are therefore being studied. Two such methods, forms part patients thermography and 70-mm. mammography (Strax and complaints. The value of clinical examination, thermography, and 70- Oppenheim, 1968; Gravelle, 1969), are the subject of this mm. mammography was compared by the percentage of cor- report, in which their diagnostic value has been compared of with that of routine clinical examination in 891 patients with rect diagnosis in each group subjects. or without symptomatic 'breast disease. on 23 September 2021 by guest. Protected copyright. Results Methods Symptomatic patients Of the 891 patients included in the diagnostic survey, 414 (aged 16-78 years) had come to hospital with symptoms of Of the 414 women in this group 214 had histologically breast disease and 477 (aged 18-78 years) had no such symp- proved benign or malignant breast disease. A further eight toms and were attending hospital for some unrelated reason, women with advanced cancer did not have histological confir- usually gynaecological. The survey included clinical examina- mation of their disease, but as the diagnosis was not in doubt tion, thermography, and 70-mm. mammography. they have been included with the malignant group. Seventy- Each patient was briefly interviewed for relevant history. seven patients had cancer and 145 had proved benign disease. The breasts were then clinically examined by one observer The remaining 192 patients in the symptomatic group had (either I.G.F. or H.J.S.). Thermography was then performed by not had a biopsy performed and were considered by the clini- technicians using an AGA Thermovision apparatus. After the cian responsible for their care to have either benign diffuse removal of clothes above the waist, the patient sat with hands disease not requiring biopsy (152 patients) or normal breasts (40 patients). This assumption was made on the findings of clinical and mammographic examinations and on the results * Clinical Research Assistant, Welsh National School of Medicine, Cardiff of follow-up for not less than 12 months. CF2 ISZ. The diagnostic accuracies of clinical examination as t Honorary Assistant Lecturer in Surgery, Welsh National School of Medicine, Cardiff CF2 ISZ. recorded by one observer and of thermography and 70-mm. t Senior Research Fellow, Epidemiological Research Unit, Cardiff. mammography as recorded by three observers in the con- Tenovus Research Fellow, Institute for Cancer Research, Cardiff. Ii Consultant Radiologist, Royal Infirmary, Cardiff. firmed cases are shown in Table I. Thermography and 70- Professor of Radiology, Welsh National School of Medicine, Cardiff mm. mammography are obviously relatively inaccurate com- CF2 oSZ. and **Professor of Surgery, Welsh National School of Medicine, Cardiff pared with clinical examination in both benign malignant CF2 I SZ. conditions. There was considerable observer error between BRITISH 462 21 November 1970 Screening Methods for Breast Diseases-Furnival et al. MEDICAL JOURNAL the three radiologists. This has been further defined in Table The addition of thermography and 70-mm. mammography Br Med J: first published as 10.1136/bmj.4.5733.461 on 21 November 1970. Downloaded from II, in which the accuracy of diagnosis in malignant disease to clinical examination enhanced the accuracy of the diagnosis has been calculated when all three radiologists agreed with of malignancy. Thus one radiologist of the three (but not the the diagnosis and when at least one report of the three same radiologist each time) correctly diagnosed cancer by radiologists was correct. thermography in six patients and by 70-mm. mammography in seven in whom the correct diagnosis was not made clinically. TABLE I.-Accuracy of Methods of Examination in 77 Patients with Cancer With the use of both methods to complement clinical exami- of Breast and in 145 Patients with Histologically Proved Benign Disease nation, 10 patients with a clinical diagnosis of benign disease of Breast. A, and C Refer to the Three Radiologists B, were suspected of having cancer. However, all these patients had a clearly palpable discrete lump in the breast and Accuracy of Diagnosis. % Correct consequently would have been submitted to biopsy. Method of Examination accuracy mam- Malignant Disease Benign Disease One of the reasons for the low of 70-mm. (77 Patients) (145 Patients) mography in this survey was the high incidence of unsatisfac- I= tory films reported by each observer. The number of ther- Clinical. .A 81-8 81-4 A 53-2 15-2 mograms and 70-mm. mammograms in the symptomatic group Thermography B 51-9 11-7 C 41-6 38-6 considered not entirely satisfactory technically by each A 48-1 49.7 70-mm. mammography B 61-0 58-3 observer but still reportable is shown in Table V: almost half C 39-0 47-6 of the 70-mm. mammograms were of inferior quality (average 45-7%) whereas 79% of thermograms were accepted as satis- mammograms the TABLE II.-Observer Error in Diagnosis in Patients (77) with Malignant factory. A similar proportion of 70-mm. in Disease of Breast by Three Radioldgists asymptomatic group were reported as imperfect, and these poor quality films did not diminish in proportion as the sur- vey proceeded. TABLE V.-Thermograms and 70-mm. Mammograms Reported as Un- satisfactory by each Radiologist (A, B, and C) in the Symptomatic Patients (414) of Examination A B C The incidence of false-positive and false-negative reports Method _ _ with each method of investigation has been calculated for Thermography _ .. 2566% 203%, 162°/ patients with histologically proved benign and malignant 70-mm. mammography .. .. .. 51i5°/o 42-3% 43 2% disease in the symptomatic group (Table III). There is a strikingly high incidence of false-negative diagnoses of cancer in patients with malignant disease. The false-positive rate in Asymptomatic patients patients with benign disease is less pronounced.
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