Calcium Gluconate and Magnesium Sulfate in Preventing Neurotoxicity in Patients With Colon Cancer or Rectal Cancer Receiving Oxaliplatin-Based Combination Chemotherapy

OBJECTIVES:

Primary

- To determine whether 2 schedules of calcium gluconate and magnesium sulfate infusions
(given before and after chemotherapy or just before chemotherapy) can prevent or
ameliorate chronic, cumulative oxaliplatin-induced sensory neurotoxicity in patients
with colon or rectal cancer receiving adjuvant FOLFOX chemotherapy comprising leucovorin
calcium, fluorouracil, and oxaliplatin.

Secondary

- To determine whether these 2 infusion schedules can increase the cumulative oxaliplatin
doses that can be delivered without dose-limiting chronic neurotoxicity.

- To determine whether these 2 infusion schedules can ameliorate acute neuropathy
associated with oxaliplatin.

- To determine whether these 2 infusion schedules cause adverse events.

- To investigate whether these 2 infusions schedules influence patient quality of life.

- To describe baseline and post-treatment neurological quantitative sensory testing
abnormalities in the study participants.

Tertiary

- To explore if polymorphisms in the GSTP1, GSTM1, ERCC2, and XRCC1 genes are associated
with early onset of oxaliplatin-induced neurotoxicity.

OUTLINE: This is a multicenter study. Patients are stratified according to age (< 65 years vs
≥ 65 years), gender, regimen (FOLFOX4 vs modified FOLFOX6 vs other), and stage of disease (II
vs III vs IV). Patients are randomized to 1 of 3 treatment arms.

- Arm I: Patients receive calcium gluconate IV and magnesium sulfate IV over 30 minutes
immediately before and after oxaliplatin administration (part of FOLFOX chemotherapy
comprising leucovorin calcium, fluorouracil, and oxaliplatin).

- Arm II: Patients receive placebo IV over 30 minutes immediately before and after
oxaliplatin administration (part of FOLFOX chemotherapy).

- Arm III: Patients receive calcium gluconate and magnesium sulfate IV over 30 minutes
immediately before and placebo IV over 30 minutes immediately after oxaliplatin
administration (part of FOLFOX chemotherapy).

In all arms, courses repeat every 14 days for 6 months in the absence of disease progression
or unacceptable toxicity.

Blood samples are collected before the second course of treatment for translational research.

Patients complete questionnaires on side effects, quality of life, and chemotherapy-induced
peripheral neuropathy periodically.

After completion of study treatment, patients are followed up at 3, 6, 12, and 18 months.

DISEASE CHARACTERISTICS:

- Histologically confirmed adenocarcinoma of the colon or rectum

- Has undergone curative resection and is considered to have stage II or III disease or
completely resected stage IV disease with no evidence of residual tumor

- Scheduled to receive 6 months of oxaliplatin-based adjuvant chemotherapy with 85
mg/m^2 oxaliplatin every 2 weeks (this includes, for instance, FOLFOX4 or modified
FOLFOX6)

- Patients receiving bevacizumab or cetuximab in combination with FOLFOX as part of
a clinical trial or clinical practice are eligible

PATIENT CHARACTERISTICS:

- ECOG performance status 0-2

- WBC ≥ 3,000/mm^3

- ANC ≥ 1,500/mm^3

- Platelet count ≥ 100,000/mm^3

- Hemoglobin ≥ 10.0 g/dL

- Total bilirubin ≤ 1.5 times upper limit of normal (ULN)

- Serum creatinine ≤ 1.5 times ULN

- Serum calcium ≤ 1.2 times ULN

- Serum magnesium ≤ 1.2 times ULN

- Not pregnant or nursing

- Negative pregnancy test

- Fertile patients must use effective contraception

- Able to complete questionnaires (alone or with assistance)

- Able to comply with study treatment

- Willing to return to enrolling institution for follow-up

- Willing to provide blood sample for research purposes

- No pre-existing peripheral neuropathy of any grade

- No family history of a genetic/familial neuropathy

- No second or third degree AV heart block or a history of second or third degree heart
block

- Bundle branch blocks are allowed.

- No other medical conditions that, in the opinion of the treating physician, would make
this protocol unreasonably hazardous for the patient

PRIOR CONCURRENT THERAPY:

- See Disease Characteristics

- Central venous access line present, or scheduled to have a central line placed before
starting chemotherapy and study treatment

- No prior treatment with neurotoxic chemotherapy (e.g., oxaliplatin, cisplatin,
taxanes, or vinca alkaloids)

- No concurrent digitalis medication

- No concurrent treatment with the anticonvulsants carbamazepine (e.g., Tegretol®),
phenytoin (e.g., Dilantin®), valproic acid (e.g., Depakene®), gabapentin (Neurontin®),
or pregabalin (Lyrica®)

- No concurrent neurotropic agents, including venlafaxine (Effexor), desvenlafaxine
(Pristiq®), milnacipran (Savella®), or duloxetine (Cymbalta)

- No concurrent tricyclic antidepressants (such as amitryptilline), or any other agent
specifically being given to prevent or treat neuropathy

- No concurrent drugs given as a neuroprotectant