C1q g/L C2 g/L C3 g/L C4 g/L A. B. C.D. E. Supplementary Figure 1 - Middleton et al. NR Supplementary Figure 1. Complement concentrations in CLL patient.

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C1q g/L C2 g/L C3 g/L C4 g/L A. B. C.D. E. Supplementary Figure 1 - Middleton et al. NR Supplementary Figure 1. Complement concentrations in CLL patient sera are not significantly affected by Binet stage. The concentrations of complement components of the classical cascade and CLL patient sera exhaustion were compared against Binet stage of disease at the point of sample collection. Mean of individual patient samples is shown. A. C1q levels compared against clinical stage (n=42). B. C2 levels compared against clinical stage (n=46). C. C3 levels compared against clinical stage (n=53). D. C4 levels compared against clinical stage (n=53). E. CLL patient sera exhaustion was also compared against clinical stage (n=54). An unpaired t test was performed, with no significant difference observed between the mean complement levels or the level of CLL sera exhaustion and the different clinical stages of disease.

C1q g/L C2 g/L C3 g/L C4 g/L A. C. E. B. D. Supplementary Figure 2 - Middleton et al. NR Supplementary Figure 2. Complement concentrations in CLL patient sera are not significantly affected by poor prognosis cytogenetics. The concentrations of complement components of the classical cascade and CLL patient sera exhaustion were compared against the different CLL cytogenetic subgroups normal/13q, 11q del and 17p del. Mean of individual patient samples is shown. A. C1q levels compared against cytogenetic subgroups (n=36). B. C2 levels compared against cytogenetic subgroups (n=39). C. C3 levels compared against cytogenetic subgroups (n=45). D. C4 levels compared against cytogenetic subgroups (n=45). E. CLL patient sera exhaustion was also compared against cytogenetic subgroups (n=40). An unpaired t test was performed, with no significant difference observed between the mean complement levels or the level of CLL sera exhaustion and the different cytogenetic subgroups.

C1q g/L C2 g/L C3 g/L C4 g/L A. C. E. B. D. Supplementary Figure 3 - Middleton et al. NR Supplementary Figure 3. Complement concentrations in CLL patient sera are not significantly affected by ZAP-70 status. The concentrations of complement components of the classical cascade and CLL patient sera exhaustion were compared against the ZAP-70 status. Mean of individual patient samples is shown. A. C1q levels compared against ZAP-70 status (n=37). B. C2 levels compared against ZAP-70 status (n=41), 25% ZAP-70 positive CLL patients are deficient in C2 compared to 10% that are ZAP-70 negative. C. C3 levels compared against ZAP-70 status (n=48). D. C4 levels compared against ZAP-70 status (n=48). E. CLL patient sera exhaustion was also compared against ZAP-70 status (n=40). An unpaired t test was performed, with no significant difference observed between the mean complement levels or the level of CLL sera exhaustion and ZAP-70 status.

Supplementary Figure 4 - Middleton et al. A. B. Supplementary Figure 4. CLL patient sera shows significantly reduced CDC activity when used for a second time. HG3 cells were treated with 20 μg/ml OFA and then incubated with 50% CLL patient sera or NHS and the level of CDC cell death measured by flow cytometry (% PI+ cells). The percentage of dead cells is expressed relative to untreated control. A. Induction of CDC from CLL patient sera for the first set of OFA-treated HG3 cells was assessed by PI staining (NHS, n=12; CLL, n=48). Serum that caused ≥40% CDC was used for secondary CDC. B. Sera from the first set of OFA-treated HG3 cells were removed from the cells and used for a second time to determine the CDC activity induced on fresh HG3 cells treated with 20 μg/ml OFA (2° use) (NHS, n=12; CLL, n=48). p values were determined by an unpaired t-test (** p<0.01).

Supplementary Figure 5 - Middleton et al. A. B. C. Supplementary Figure 5. CLL sera exhaustion also negatively correlates with C4 levels. Figure 4 demonstrates that complement component C2 concentration shows a significantly negative correlation with CLL patient sera exhaustion. Complement C4 concentration also displays a significant negative correlation with CLL sera exhaustion levels but to a lesser degree. A. C1q levels in CLL patient sera were compared against CLL patient sera exhaustion (n=43). Linear regression was applied to obtain values for r 2, and p value, B. C3 levels in CLL patient sera were compared against CLL patient sera exhaustion (n=47). Linear regression was applied to obtain values for r 2, and p value, C. C4 levels in CLL patient sera were compared against CLL patient sera exhaustion (n=43). Linear regression was applied to obtain values for r 2, and p value,

i. C2 deficientii. C4 deficient iii. C2/C4 deficientiv. C2/C3/C4 deficient A. B. Supplementary Figure 6 - Middleton et al. Supplementary Figure 6. CLL sera exhaustion in complement deficient serum can be restored with the addition of C2 alone. CLL sera that had complement deficiencies in C2, C3 and/or C4 were supplemented with C2 (50 μg/ml), C4 (700 μg/ml) or both C2/C4 (25 μg/ml/350 μg/ml respectively), before being used to induce CDC in HG3 cells treated with 20 μg/ml OFA (1° use). After the incubation period, sera was removed and re-challenged with HG3 cells treated with 20 μg/ml OFA (2° use). Percentage of dead cells is relative to untreated control. A. (i) Representative CLL patient serum sample deficient in C2 alone. (ii) Representative CLL patient serum sample deficient in C4 alone. (iii) Representative CLL patient serum sample deficient in C2 and C4. (iv) Representative CLL patient serum sample deficient in C2, C3 and C4. B. CLL sera (n=16) that exhibited high levels of serum exhaustion were supplemented with C2 (n=14), C4 (n=9), C2 and C4 combined (n=8) Mean cell death + SEM are shown. p value were obtained by paired t test (* p<0.05, ** p<0.01, *** p<0.001).