Genetic variants of SP-D confer susceptibility to radiation pneumonitis in lung cancer patients undergoing thoracic radiation therapy.

Whether chemotherapy was performed or not was regarded as an influencing factor of RP in some studies, 38 but in our study only 2.5% patients received radiotherapy alone and the results did not reach statistical significance ( P grade ≥2 = 0.841 and P grade ≥3 = 0.097).

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