[Comparison of conventional chest radiography and computed tomography for evaluation of the degree of regression in neoplasms of patients treated for small cell lung cancer].

The aim of the study was to assess how objective is the estimation of the chest lesions regression on RT picture and how extent chest CT can increase the precision of this assessment. The material consisted of 66 SCLC pts observed in the Institute of Tuberculosis and Lung Diseases in Warsaw between 1987 and 1994 in whom RT and CT were performed to estimate the degree of response to treatment. Chest RT were estimated by 4 specialists independently. In 28 cases (42%) opinion concerning the degree of tumor regression was the same. In 23 cases (35%) the opinions were discordant and in 15 cases (13%) (mainly after chest irradiation) all examiners agreed that degree of response is impossible to precise (it ranged between PR and CR). In the second part of this study the degree of cancer regression was assessed in the same patients by 2 specialists independently estimated CT pictures. Opinions were different only in 4 cases. The comparison between these two methods was done. CI examination allowed exact estimation of response degree in 20 out of 24 pts (83%) in whom this assessment was impossible using chest radiography. In 9 cases (21%) the assessment of chest CT changed the previous estimation made using chest radiography (in 5 cases from CR to PR and in 4 cases from PR to CR). In conclusion-estimation of tumor regression using chest RT is very subjective method and many errors are possible. Chest CT estimation is a much better method for estimation of tumor response especially in irradiated patients.