The phrase "alone for two cycles" is correct and usable in written English.
It can be used in contexts where you want to indicate that someone or something is by itself for a duration of two cycles, which could refer to time, events, or processes.
Example: "The experiment was conducted alone for two cycles to ensure accurate results without external interference."
Alternatives: "isolated for two periods" or "solitary for two rounds".
She then received trastuzumab alone for three cycles with stable disease after which her markers began to rise and ascites and omental disease were seen on CT scan.
The patient underwent surgical removal of tumor lesion, post-surgical whole-brain radiotherapy (WBRT) and systemic chemotherapy with carboplatin alone for six cycles.
The patient underwent a multimodal and aggressive treatment, including surgical resection of the tumor lesion, post-surgical WBRT and systemic chemotherapy with carboplatin alone for six cycles that led to a complete and prolonged tumor control.
GOG 132 was a three-arm trial of 3-weekly paclitaxel 135 mg m−2 over 24 h plus cisplatin 75 mg m−2 compared with high-dose cisplatin (100 mg m−2) or paclitaxel (200 mg m−2 over 24 h) alone, each for six cycles, in 614 patients (Muggia et al, 2000).
Animals selected for this study were divided into eight groups (n = 5-6 each) including: A) radiation treatment alone (0.5 Gy/day for 20 days); B) cisplatin treatment alone (3 mg/kg/week for three cycles, i.p).; C) MF alone (2 mg/kg/day, s.c).
Patients who responded to treatment, or had stable disease on completion of six cycles of the combination were eligible for continuation of temozolomide alone for six further cycles of treatment in accordance with the regimen used in the phase III trial comparing temozolomide with DTIC, where up to 12 cycles of treatment were permitted (Middleton et al, 2000).
They were randomized to receive trastuzumab (Herceptin) and chemotherapy (5-fluorouracil or capecitabine and cisplatin) for six cycles or chemotherapy alone.
All patients received weekly neoadjuvant trastuzumab (4 mg kg−1 loading dose, followed by 2 mg kg−1 once weekly) in combination with either docetaxel alone (100 mg m−2 every 3 weeks for six cycles) or docetaxel (75 mg m−2 every 3 weeks for six cycles) combined with carboplatin (AUC 6) every 3 weeks for six cycles.
In this trial, 410 patients with locally advanced or metastatic biliary cancer were randomized to receive either cisplatin (25 mg/m ) with gemcitabine (1000 mg/m ) on days 1 and 8, every 3 weeks for eight cycles or gemcitabine alone (1000 mg/m ) on days 1, 8, and 15, every 4 weeks for six cycles for up to 24 weeks.
Treatment was given every 3 weeks for four cycles and followed by dacarbazine alone through week 22.
