A 10-yr-old boy is noted to have hematuria and proteinuria on a routine physical examination. He is without complaints, and examination findings are normal. Results of blood chemistry studies are also normal, but analysis of the 24-hr urine specimen reveals 2 g of protein and a normal creatinine clearance. A renal biopsy is performed, which reveals mesangial proliferative glomerulonephritis with very bright immunoglobulin A deposits in the mesangium on immunofluorescence. Which of the following statements is true regarding this child's form of glomerulonephritis?