Relative risk following prostate cancer, breast cancer, head and neck cancer or lung cancer by type of second primary cancer and sex, Queensland, 1982-2006. CNS: central nervous system; PCT: plasma cell tumour. Vertical black line indicates SIR point estimate; grey shading indicates SIR 95% confidence interval. The SIR for a second primary prostate cancer following a first primary prostate cancer was 0.3 and is not shown in Figure 2a. No cases of lymphoid leukaemia following head and neck cancer were recorded for females (Figure 2d). X-axes are shown on a log scale. Note different scale endpoints for x-axis used in Figures 2d, 2e and 2f.