Interestingly, having a locally-advanced tumor was independently prognostic for both post-RT Hb level (Estimate 0.62, CI: 0.05–1.19; p = 0.034) as well as for improvement of anemia/Hb (OR 7.19, CI: 2.56–22.45; p < 0.001). Here, GSTM1 is linked to anemia.