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. 2022 Jul 15;12:916650. doi: 10.3389/fonc.2022.916650

Table 3.

Different grades of toxicities in first and second cycles (N=52) caused by 5-FU-based chemotherapy in the patients with different genotypes of MTHFR polymorphism.

Toxicity Gene Genotype N First cycle Second cycle
Grade 1-4an (%) P Grade 3-4bn (%) P Grade 1-4an (%) P Grade 3-4bn (%) P
Anemia MTHFR 677G>A GG 35 19 (54.3) 0.223 0 (0.0) ND 14 (40.0) 0.333 0 (0.0) ND
GA + AA 17 12 (70.6) 0 (0.0) 9 (52.9) 0 (0.0)
MTHFR 1298A>C AA 31 17 (54.8) 0.343 0 (0.0) ND 13 (41.9) 0.650 0 (0.0) ND
AC + CC 21 14 (66.7) 0 (0.0) 10 (47.6) 0 (0.0)
Leucopenia MTHFR 677G>A GG 35 8 (22.9) 0.544 0 (0.0) 0.036* 11 (31.3) 0.224 0 (0.0) ND
GA + AA 17 5 (29.4) 2 (11.8) 8 (47.1) 0 (0.0)
MTHFR 1298A>C AA 31 7 (22.6) 0.579 2 (6.5) 0.568 12 (38.7) 0.660 0 (0.0) ND
AC + CC 21 6 (28.6) 0 (0.0) 7 (33.3) 0 (0.0)
Neutropenia MTHFR 677G>A GG 35 11 (31.4) 0.768 5 (14.3) 0.712 10 (28.6) 0.945 1 (2.9) 0.049*
GA + AA 17 4 (23.5) 3 (17.6) 5 (29.4) 3 (17.6)
MTHFR 1298A>C AA 31 9 (29.0) 0.968 4 (12.9) 0.488 9 (29.0) 0.968 2 (6.5) 0.640
AC + CC 21 6 (28.6) 4 (19.0) 6 (28.6) 2 (9.5)
Thrombocytopenia MTHFR 677G>A GG 35 0 (0.0) ND 0 (0.0) ND 0 (0.0) <0.001* 0 (0.0) 0.195
GA + AA 17 0 (0.0) 0 (0.0) 5 (29.4) 1 (5.9)
MTHFR 1298A>C AA 31 0 (0.0) ND 0 (0.0) ND 5 (16.1) 0.059 1 (3.2) 0.405
AC + CC 21 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0)

ND = Not determined; * P value < 0.05 was considered statistically significant. aGrade 1–4 was considered as toxicity. bGrade 3–4 was considered as severe toxicity.